Algorithms

Join us at Pubkey DC for the BitPlebs! DC BitPlebs are [Socratic Seminars](https://en.wikipedia.org/wiki/Socratic_method) that do not require advanced and technical understanding of Bitcoin. The topics we discuss include: \- Freedom tech \- Hashrate and mining economics \- Custody and self\-sovereignty \- On\-chain data \- Scaling solutions \(LN\, Ark\, Cashu\) \- Privacy ​The full agenda will be posted [here](https://bitcoindistrict.org/bitplebs). **IMPORTANT: No photos, videos, or audio recordings. The meeting will be held under the Chatham House rule, meaning it's ok to share information and stories from the session, but not to share who said what.** # **Agenda:** 6:00PM - 7:00PM - Meet & greet 7:00PM - 8:30PM - Discussion of recent bitcoin related news & developments 8:30PM - 10PM - Hangout

Join us for another lowkey writing session! Bring your laptop, iPad, or notebook so that you can get some words down! We will start around 6:00 as people filter in. Writing, chatting, and casual introductions will go on until 6:30 as people arrive and grab food and drinks, when we will do a round-table to introduce ourselves, our genres and writing styles, and what we are looking for from the group. After that, we can buckle down to do some writing and make ourselves be productive! I will try to snag the big community table to the right of the registers at Tatte, or sit against the back wall with a couple of tables pulled together, so you can look for me there. I'll post in the comments when I arrive, so feel free to check there or message me if you are feeling lost or having difficulty finding the group. I'll look forward to meeting you all! Our next workshop will take place on the Monday following this one, so look forward to that, as well!

Use Promo code WINTERME to receive $5.00 off! Purchase tickets here: [https://www.prosinthecity.com/event/speed-dating-washington-dc-16060](https://www.prosinthecity.com/event/speed-dating-washington-dc-15387) Tonight, Professionals in the City is hosting an event for singles age 50 plus. Our Speed Dating Washington DC events are among our most popular singles events so don't miss out! During Speed Dating Washington DC you'll date for approximately one hour, meeting smart and intriguing members of the opposite sex as you spend a few minutes with each new acquaintance. Meet singles and know right away whom you mutually match with. After the speed dating, join us for a night of socializing and more interactions. You’ll also be able to spend time with someone you felt you clicked with during one of your speed dates. There will be a cash bar for this eventful evening, so come and meet other single professionals like yourself and have the time of your life! Then, after the event, use our exclusive online system from home to choose your matches from the people you met at the event. Without disclosing your email address, you'll be able to send messages through our system to anyone who attended. So come to Speed Dating Washington DC and meet that special someone you’ve been looking for. Check in is at 7:00 and the dating begins at 7:20. Please check in at 7:00 so you have a chance to mix and mingle before the dating begins. Numbers are limited at this event so sign up soon!

## Details Hello everyone! We climb at Crystal City Movement every Monday. Please read rest of the description carefully. We mostly do tope rope climbing but we can arrange bouldering sessions as well. If you prefer lead climbing please post on the comments to find your belay partner. \#\# Requirements * If you are not a Movement member, you'll get a daily pass. If you don't have the equipments you can rent them in the gym. * Please sign the waiver through: [https://movementgyms.com/waiver/](https://movementgyms.com/waiver/) * You can get a discounted day pass and free rental gear if you say you are here for my meetup All skill levels are welcome! If you are totally new to climbing and want to do top rope, then you have to have a belay certificate. In order to do that; * You can check Movement gym Intro to Rope Climbing class : [https://movementgyms.com/crystal-city/climbing/classes/](https://movementgyms.com/crystal-city/climbing/classes/) * After the course, you should do the 'Belay Check' which can be done as soon as 24 hours after you take the class. The test takes around 15 mins so it can be done before the climbing session. Before your first visit you may want to check the related webpage: [https://movementgyms.com/first-visit/](https://movementgyms.com/first-visit/) \#\# Where to meet To find us go down the stairs in front of the front desk. We will meet around the benches next to climbing walls.

This CREATIVE HAPPY HOUR -and- EDUCATIONAL DISCUSSION is for creative people and folks who appreciate creativity. Whether you attend, produce, appreciate, or promote, you are welcome to join us on Monday, February 23, 2026 from 5pm-7pm for CREATIVE HAPPY HOUR -and- EDUCATIONAL DISCUSSION at Silver Branch Brewing Co in Silver Spring, MD. Register on Eventbrite at [https://HappyHour2-23-26.eventbrite.com](https://HappyHour2-23-26.eventbrite.com). Come meet, network, and enjoy. Only those ages 21 and up can attend. Happy Hour specials are from 5pm-6pm: $5.95 beer and select drinks. Entrance is free. This is a casual event. Join us as Paul Marengo, the Festival Director of ReelAbilities Film Festival: Greater Washington, will lead a 30-minute educational discussion on grant writing designed for filmmakers and arts organizers. In this session he will break down key elements of successful grant proposals, offer practical advice on identifying suitable funding opportunities, and share insights into how to communicate project goals and community impact effectively to potential funders. Register on Eventbrite at [https://HappyHour2-23-26.eventbrite.com](https://HappyHour2-23-26.eventbrite.com). Check out our DC Filmmakers T-shirts on Amazon at[ https://a.co/d/gXACa1Y](https://a.co/d/gXACa1Y) to help support the group. This event is produced by[ DC Filmmakers Group](https://www.facebook.com/groups/dcfilmmakers) in partnership with[ TIVA](https://www.tivadc.org/) (Television, Internet, and Video Association of DC),[ WIFV](https://www.wifv.org/) (Women in Film & Video),[ Wheaton Film Festival](https://www.wheatonfilmfestival.com/),[ Docs in Progress](https://www.docsinprogress.org/), DC Media Makers Group, etc. Sponsored by[ Brian Frankel Law Firm PLLC](https://brianfrankel.com/),[ Creative Colony Spaces](https://www.creativecolonyspaces.com/membership/overview), [ ](https://reelabilities.org/greaterwash/)[ReelAbilities Film Festival: Greater Washington](https://reelabilities.org/greaterwash), and Adobe Software. Enjoy delicious craft beers, tasty snacks, and great company in a relaxed atmosphere. Whether you're a beer enthusiast or just looking to unwind after a long day, this event is perfect for you. Don't miss out on the opportunity to kick back and relax with us at Silver Branch Brewing Co. Use the QR codes at the table to order food and drinks, and be prepared to mingle. Check out the[ Silver Branch Brewing Company's Menu](https://www.silverbranchbrewing.com/lagerhaus-biergarten/). PARKING: Paid parking available one block away at the county's Cameron Street Garage on 8530 Cameron Street (Better pricing than street or private parking.) See you there on 2/23/26! Register on Eventbrite at [https://HappyHour2-23-26.eventbrite.com](https://HappyHour2-23-26.eventbrite.com).

Climbers of all skill levels are welcome! To join us: 1. Complete the [participant agreement](https://movementgyms.com/participant-agreement/). 2. Pass the belay check, which can be done the same day. See [FAQs](https://movementgyms.com/first-visit/#faqs) for more info. 3. Pay for [gym membership or day pass](https://movementgyms.com/memberships-passes/). The event itself is run by volunteer organizers free of charge. If you are interested but have never belayed before, please take the [Introduction to Rope Climbing](https://movementgyms.com/rockville/calendar/#activity=climbing&location=rockville&class-type=intro-series&area-of-focus=safety-and-belaying) class first. We'd love to climb with you as soon as you know how to belay safely using a GriGri. To find us, go past the front desk and turn left. We'll gather by the fitness room entrance. If you need a refresher on knot tying and/or belaying, please post in comments or message the host and we'll be happy to help. We normally top rope in groups of 2-3 people, but some are also happy to lead. Post in comments or ask on the spot if you are interested in leading.

This CREATIVE HAPPY HOUR -and- EDUCATIONAL DISCUSSION is for creative people and folks who appreciate creativity. Whether you attend, produce, appreciate, or promote, you are welcome to join us on Monday, February 23, 2026 from 5pm-7pm for CREATIVE HAPPY HOUR -and- EDUCATIONAL DISCUSSION at Silver Branch Brewing Co in Silver Spring, MD. Register on Eventbrite at [https://HappyHour2-23-26.eventbrite.com](https://HappyHour2-23-26.eventbrite.com). Come meet, network, and enjoy. Only those ages 21 and up can attend. Happy Hour specials are from 5pm-6pm: $5.95 beer and select drinks. Entrance is free. This is a casual event. Join us as Paul Marengo, the Festival Director of ReelAbilities Film Festival: Greater Washington, will lead a 30-minute educational discussion on grant writing designed for filmmakers and arts organizers. In this session he will break down key elements of successful grant proposals, offer practical advice on identifying suitable funding opportunities, and share insights into how to communicate project goals and community impact effectively to potential funders. Register on Eventbrite at [https://HappyHour2-23-26.eventbrite.com](https://HappyHour2-23-26.eventbrite.com). Check out our DC Filmmakers T-shirts on Amazon at[ https://a.co/d/gXACa1Y](https://a.co/d/gXACa1Y) to help support the group. This event is produced by[ DC Filmmakers Group](https://www.facebook.com/groups/dcfilmmakers) in partnership with[ TIVA](https://www.tivadc.org/) (Television, Internet, and Video Association of DC),[ WIFV](https://www.wifv.org/) (Women in Film & Video),[ Wheaton Film Festival](https://www.wheatonfilmfestival.com/),[ Docs in Progress](https://www.docsinprogress.org/), DC Media Makers Group, etc. Sponsored by[ Brian Frankel Law Firm PLLC](https://brianfrankel.com/),[ Creative Colony Spaces](https://www.creativecolonyspaces.com/membership/overview), [ ](https://reelabilities.org/greaterwash/)[ReelAbilities Film Festival: Greater Washington](https://reelabilities.org/greaterwash), and Adobe Software. Enjoy delicious craft beers, tasty snacks, and great company in a relaxed atmosphere. Whether you're a beer enthusiast or just looking to unwind after a long day, this event is perfect for you. Don't miss out on the opportunity to kick back and relax with us at Silver Branch Brewing Co. Use the QR codes at the table to order food and drinks, and be prepared to mingle. Check out the[ Silver Branch Brewing Company's Menu](https://www.silverbranchbrewing.com/lagerhaus-biergarten/). PARKING: Paid parking available one block away at the county's Cameron Street Garage on 8530 Cameron Street (Better pricing than street or private parking.) See you there on 2/23/26! Register on Eventbrite at [https://HappyHour2-23-26.eventbrite.com](https://HappyHour2-23-26.eventbrite.com).

Come kick back with the Black Code Collective! We'll be on the second floor by the main entrance in the mall!

Join us for a thought-provoking conversation as we discuss ***Enshittification: Why Everything Suddenly Got Worse and What to Do About It* by Cory Doctorow** Here's the summary: **Explaining the process of the “enshittification” of digital platforms over time and what to do about it.** Cory Doctorow's *Enshittification* takes a witty yet incisive look at the tech landscape, where platforms like TikTok, Facebook, and Google start off great—before they inevitably turn terrible. In this contemporary moment of digital decline, Doctorow explores how tech giants lure users in with convenience and then degrade their services over time, squeezing profit at the cost of user experience. With a mix of sharp humor and deep insight, he unveils the slow creep of "enshittification," turning the online world into a worse place, one algorithm at a time. **Let’s meet at Caboose Commons in Fairfax to enjoy some good discussion and meet new friends.**

Title : Design of a Quantum Photonic Full Adder Gate based on an 8-mode Integrated Optical Circuit Date: Feb 28 2026 Noon - 14:00 EST Abstract: Multiport interferometers designed using the Clements decomposition algorithm can be used to implement compact quantum-photonic full-adder (FA) gates on photonic integrated circuits (PICs). By expressing each element of the FA gate matrix in terms of the permanent of a non-unitary matrix, enabled through Boson sampling, the required number of MZIs in the gate can be further reduced. In this presentation, we will discuss the design of an FA gate modeled as a four-photon scattering process on an eight-mode integrated optical circuit, where the permanents of submatrices determine the output probabilities. Simulation results demonstrate a fidelity of 1 and a success probability of 2.22 × 10⁻⁴ for the FA gate. We will also examine the impact of phase-shifter and attenuator variations on fidelity and success probability using Ansys Q-Interconnect software. Finally, we will compare the performance of the proposed FA gate with a benchmark Toffoli gate designed using the same approach. Speaker: Shafiqul Hai received the B.Sc. degree in Electrical and Electronic Engineering from the Bangladesh University of Engineering and Technology (BUET), Dhaka, Bangladesh, in 2007, and the M.Eng. (Thesis) and Ph.D. degrees in Electrical Engineering from McGill University, Montreal, QC, Canada, in 2011 and 2016, respectively. He is currently an Assistant Professor in the Department of Electrical and Computer Engineering at Lakehead University. His research interests include the modeling and characterization of compact nanophotonic devices and components for next-generation optical fiber and RF communication systems, as well as quantum computing on photonic integrated circuits. He is the author or coauthor of more than 12 peer-reviewed journal papers and 15 conference publications. Moderators: Dr. Pawel Gora, CEO of Quantum AI Foundation ([https://www.qaif.org/](https://www.qaif.org/)) , Dr. Sebastian Zajac , member of QPoland ([https://qworld.net/qpoland/](https://qworld.net/qpoland/)) This is an online event. Zoom registration form will be emailed to registrant and posted on the event forum by Feb 28 2026 11:00 am EST.

In an era focused on scalable efficiency, the pursuit of absolute service consistency is often seen as the ultimate goal. But what is gained and what is lost when service offerings are entirely predictable? Does aiming for uniformity stifle necessary adaptation and human connection? Join us for an intimate discussion exploring the often overlooked trade-offs of **service consistency**. We'll dive into when consistency builds “trust and reliability”, and when it becomes “a barrier to designing flexible, empathetic, and truly customer-centric experiences”. **#ServiceDesign #ServiceConsistency #ServiceManagement** **What’s a Service Design DC salon?** Our salons are an excellent opportunity to connect with fellow designers, engage in meaningful conversations, and gain fresh perspectives on the evolving landscape of our field. Space is limited to ensure an intimate atmosphere and encourage deeper conversations. Whether you have been to a past salon or will be a first timer, we’d be happy to have you join this group discussion of service design practitioners and enthusiasts in the Washington D.C. area! **Evening Agenda** * 6:00 P.M. - Doors Open / Socializing \* * 6:30 P.M. - Salon begins * 8:00 P.M. - Salon Wraps up \*We will provide light refreshments, including food and drinks, during the salon. **Note about RSVPs:** * Due to the limited number of available spots, we kindly request that you update your RSVP if you are unable to attend so others may have the opportunity to join. Thank you for your understanding. *** Many thanks to our host and sponsor, **Technical Assent!** *At Technical Assent, we believe that government can be a platform for service innovation where services can be designed to be more relevant to customers, more reliable, and delivered at a lower cost.* *Our company exists to build high-performing government service organizations — government-to-citizens (G2C), government-to-government (G2G), and shared services. Our approach is unique in that we improve service performance from the bottom-up, starting with customer experience. We use that insight to design and modify the talent, tools, and technology that deliver government services to each customer. Technical Assent is a Service-Disabled Veteran Owned Small Business appraised at CMMI-SVC Level 3.*

Join us for an hour of writing! We’ve discovered that it’s strikingly helpful to write with other writers. See if it’s true for you at **7:00 PM on Wednesday evenings.** Edit: As of January 7, 2026, we will be back at Starbucks! Be it a book, blog, script, essay, dissertation, resume, melody, poem or just plain work stuff, you are invited to write it with us. No one will see what you've written or give you unsolicited advice. Instead of just thinking about writing, come and get some real writing done. **We'll meet inside the coffee shop**. Please buy something to ensure we're welcome back. Sit down anywhere, but let me know you're here so we can introduce ourselves and check in before and after writing! (I'll be the one with the sign.) **SCHEDULE:** 7:00 - Quick introductions 7:20 - Timer starts: write for 1 hour 8:20 - The End: chat, take off, or keep writing Writing is very solitary. Connecting (and sometimes even commiserating) with other writers is a cool thing. BEING LATE IS OKAY: just show up and get settled, then check-in with me after the session. If you were on time, please be willing to make room for the friendly latecomer. Happy writing and I look forward to seeing you! **What Should I Bring?** Whatever you need to be able to write! Note that outlets are limited, so please make sure your devices are charged. Bring earbuds/earplugs if you want to block the overhead music or the conversation by other patrons. **Other Important Details:** Starbucks has WiFi. TRAVEL / PARKING: The shopping area is about a twenty minute walk from the College Park or P. G. Plaza/Hyattsville Crossing Metro Stations. There's also a bus stop right outside the shopping center on Baltimore Ave. Parking is free. SEATING INFORMATION: Seating is first come first serve. I'll try to grab a table, but be prepared to sit down anywhere. FOOD GUIDELINES: Tea, coffee, and light food are available at the coffee shop. Please thank our hosts by purchasing something to drink.

The rise of practical AI tools is exciting. Right now, tools like ChatGPT and other LLMs are our primary touch points with generative AI. But this doesn't mean we should only be generating content with LLMs (for context we'll also briefly touch on non-LLM probabilistic approaches as well). Since these powerful tools are new to all of us and none of us know the future, we'll explore together other ways of using generative LLMs and how this intersects with automation in general. **About David** David works with organizations in early planning for big transformations of complex suites of websites, applications, and systems. David helps companies set their vision, make key systems architecture decisions, and define how to make these major changes happen. Clients include Centers for Disease Control and Prevention; Central Bank of Belize; Mideast Broadcasting Corporation; National Academies of Science, Engineering, and Medicine; and Novartis.

**NEW LOCATION: Improving Office in Franklinton** Physical location: Improving Office 330 Rush Alley Suite #150 Columbus, OH 43215 Schedule: * 6:00 p.m.: Socialize, eat, and drink. Improving will be providing pizza and beverages. * 6:30 to 8:00 pm. Main meeting and presentation(s). See the handy Parking Map - we recommend street parking. [Street Parking Map](https://docs.google.com/presentation/d/1u2A4fLNlxwLJn0KA_hKc8bnFlFHLvsHBDh-_8wzX_tk/edit?usp=sharing) We meet on the last Monday of each Month. Presentations are given by members and friends of this group. If you would like to do a presentation (small or large) on a python topic, please contact centralohpython@gmail.com

We are excited to host Guided Meditations on Sundays at 6 pm in our Ashram/Gallery/Home! !! !! Everyone wants to know what kind of God we worship and what kind of meditation we do. We worship the GOD that LOVES US! We understand that god is an energy and it lives in us as us. Our meditations guide others to actually experience that energy! xoxo We don't just talk about peace, love and affection, we experience it :) Also we are a home not a business, so we enjoy building community one friend at a time. We always build in time for people to mingle & develop friendships! xoxo Much Love, Frank Tennyson Namaste, Frank Tennyson http://photos3.meetupstatic.com/photos/event/a/f/9/9/600_447824953.jpeg

Join the Columbus AI community for our quarterly gathering — a casual, community-focused evening where everyone has a chance to share, learn, and connect. These open mic–style events give anyone in the community up to **5 minutes** to present a project, share a tool, pose a question, or offer a perspective on the evolving AI space. No slides required — just a welcoming space to exchange ideas and keep the local AI conversation moving. If you’d like to take the stage, message **Chris (the organizer)** with a **title and short description** of what you’d like to share. Whether you’re deep in the field or just getting curious, come connect with others building and exploring AI in Columbus. Sponsored by [Transform Labs](https://www.transformlabs.com/services)

Rev. Steven Clevenger is an ordained spiritualist minister with over 40 years experience as a Spiritual Healer, Clairvoyant and Spiritual Teacher, educated and trained at the White Lily Chapel. Rev. Siobhan Wolf Shaffer is an ordained spiritualist minister and certified medium and healer with over 20 years experience. She began her development in 1988 in Pennsylvania and continued when she moved to Ohio in 1998 where she studied at Rays of Lights Church with Rev. Steven Clevenger. Our full worship services consist of an inspirational lecture, healing meditation, and messages from the spirit world that serve to demonstrate evidence of eternal life. Please visit our Official Church Website (http://raysoflightchurch.com) for more information.

Bring your work or your hobby, hang out, and code with us. Follow @buckeyecocoa for more information.

We'll meet at The Capital One Café, 167 Easton Town Center, Space A-103. This is in the main mall where the Microsoft store used to be, on your left if you're standing at the bottom of the AMC Theater escalator. Join us on Saturday for an hour of uninterrupted wordmaking! • What we'll do Join us for an hour of writing! We’ve discovered that it’s strikingly helpful to write with other writers. See if it’s true for you at 10AM on Saturday mornings. Be it a book, blog, script, essay, dissertation, resume, melody, poem or just plain work stuff, you are invited to write it with us. No one will see what you've written or give you unsolicited advice. Instead of just thinking about writing, come and get some real writing done. SCHEDULE: 10:00 - SESSION 1: quick intros. 10:10 - timer starts: write for 1 hour. 11:10 - chat / take off / keep writing. OPTIONAL SOCIALIZING happens at 11A-11:30ish. Writing is very solitary. Connecting (and sometimes even commiserating) with other writers is a cool thing. BEING LATE IS OKAY: just show up and get settled, then check-in with me after the session. (I’ll be the person with the Shut Up & Write! sign.) If you were on time, please be willing to make room for the friendly latecomer. Happy writing and I look forward to seeing you! • What to bring Whatever you need to be able to write! Bring earbuds/earplugs if you want to block noise or the occasional conversation by other patrons. Electrical outlets are limited, so charge your devices before whenever possible. See you at The Café on Saturday!

**Important time note:** Please plan on arriving between 5:30 and 6:00 as the elevators lock after 6 and you'll need to message us and we'll need to come get you. The building address is 4450 Bridge Park The entrance is 6620 Mooney St, Suite 400 You will need to scan your ID at the door to get a visitor badge. **Abstract** *Spec-Driven Development with GitHub Spec-Kit: From Intent to Implementation* Spec-driven development flips the traditional workflow on its head: instead of code being the source of truth, the specification becomes the backbone of design, collaboration, and delivery. In this session, we’ll explore how GitHub Spec-Kit enables teams to treat specifications as first-class artifacts—living documents that drive architecture, implementation, and verification. You’ll learn how Spec-Kit helps teams clearly express intent using structured, version-controlled specs that live alongside code. We’ll walk through a practical workflow that starts with defining system behavior and constraints, then progressively refines those specs into testable, automatable outcomes. Along the way, we’ll show how specs can reduce ambiguity, improve cross-functional collaboration, and make design decisions explicit before a single line of production code is written. This talk will cover: --What spec-driven development is (and what it isn’t) --How GitHub Spec-Kit fits into modern developer workflows --Using specs to align product, engineering, and AI-assisted development --Real-world examples of turning specs into implementations with confidence Whether you’re building greenfield systems, integrating AI into your stack, or trying to reduce costly rework, spec-driven development offers a scalable way to move faster without sacrificing clarity. Attendees will leave with concrete patterns and a clear mental model for adopting GitHub Spec-Kit in their own projects. **YouTube Link** TBA