Gadgets

Want to mess with some electronics? Or perhaps contribute to HacDC's main group project? HacDC's latest event brings hardware projects to the community. We will focus primarily on the main project (Space Blimp!) but please feel free to bring some of your own projects to show off and work on!

A small team of AWS Solutions Architects not traditional software engineers, built AIRE Traffic Control (ATC), a production agentic AI platform now serving thousands of builders. We used AI at every stage: spec-driven development, AI-generated code, automated testing, and agentic workflows. In this talk, we'll share the real story, the architecture, the failures, the breakthroughs, and what we learned about driving adoption from 32% to 92% in 10 weeks. You'll walk away with practical patterns for building multi-agent systems, using AI-DLC methodology, and empowering non-traditional dev teams to ship production-grade applications.

**Agenda:** • 5:00 PM - Doors Open (in-person attendees). • 5:30 PM - **Deep Dive into Claude Code** • 6:30 PM - Networking • 7:00 PM - Doors Close **Talk Overview:** **Deep Dive into Claude Code** Ever wondered what happens under the hood when Claude Code runs your next Android task? This talk dives into the internals of Anthropic's AI coding agent — its bootstrap pipeline and agent loop. You'll see how fork agents share prompt-cache prefixes to cut input token costs and how four-layer context compression keeps long conversations from exhausting the window. You'll leave with a mental model of how this production AI agent actually works. Whether you're building custom MCP integrations, orchestrating multi-agent tasks, or just trying to get more from the tool you use every day, you'll have a toolkit of patterns to apply to your own Android workflows. **Speaker**: Mohit Sarveiya **Speaker Bio:** Staff Android Engineer AirBnb & Google Developer Expert **How to find us:** 1680 Capital One Drive, McLean, VA 22102 We'll be located in C2 **100 D/E**. The area is publicly accessible. If you can't find it, you can ask the front desk for directions to the **C2 100 D/E** **Attending Virtually?** Zoom Link: [https://us06web.zoom.us/j/84509924569?pwd=jLXAAyOY94b9BARoiACKtKz16MoDi1.1](https://www.google.com/url?q=https://urldefense.com/v3/__https://us06web.zoom.us/j/84509924569?pwd%3DjLXAAyOY94b9BARoiACKtKz16MoDi1.1__;!!FrPt2g6CO4Wadw!LFvXbAXwA9nr_LdcnaIwoMGePe66Msg5rsnSUkUB9Z2ixCtXMfmUuOCTC5hZPsJVUdvuRVQrAUvdV-jdXQm6$&sa=D&source=calendar&usd=2&usg=AOvVaw16hb6F9SrCsaIabEet1HR7) Meeting ID: 845 0992 4569 Passcode: 754789 **Parking**: You can park at 1680 Capital One Drive; this garage has a sign indicating public parking. Or at the WEGMANS parking lot.

https://www.thepointdc.com/ This beautiful bar and restaurant with delicious food and awesome happy hour will be the side of our first summer meetup. It's accessible through Waterfront Metro and Buzzards Point shuttle. Or a 15 minute walk Our crypto meet up is basically everyone. We are not officially connected with any group or government nothing like that so it's just a very chill place for OG crypto people and new people to have a drink and talk crypto . It will probably be pretty crowded if the weather is nice but it's a really big bar with a big outdoor deck. I will have a colored candle with me identification purpose identification purposes. It's a beautiful place where the Anacostia and the Potomac River's meet. !I hope to see you there!

### **The Greenbelt Chapter** **Where curiosity meets community.** The **Greenbelt Book Club** is a welcoming neighborhood gathering dedicated to exploring diverse perspectives through the power of literature. Whether you’re a lifelong reader or looking to rediscover the joy of books, we offer a space for meaningful dialogue and connection. *** ### **What to Expect** Our gatherings are casual, engaging, and centered on shared discovery. Every month, we dive into new selections—ranging from contemporary fiction and historical deep-dives to thought-provoking non-fiction. * **The Discussion:** We move beyond simple "likes" and "dislikes" to explore the themes, characters, and bigger questions each book raises. * **The Atmosphere:** Expect a low-pressure environment where every voice is valued. You don’t need to be a literary critic to participate; you just need an open mind. * **The Connection:** We are all about building local friendships. It’s a great way to meet neighbors who share a love for learning and storytelling. *** ### **Meeting Details** * **When:** Every **Wednesday and Friday** * **Time:** 5:00 PM * **Where:** 9200 Edmonston Road, Greenbelt, MD 20770 *** ### **How to Join** Joining is easy! Simply show up at our meeting location at the times listed above. No long-term commitment is required—feel free to drop in for a single session to see if it’s a good fit for you, or join us every week. **We can’t wait to turn the page on a new adventure with you!**

**THIS CLASS IS OFFERED THROUGH CAPITAL PHOTOGRAPHY CENTER** **PLEASE REGISTER WITH CAPITAL PHOTOGRAPHY CENTER, NOT MEETUP!** https://capitalphotographycenter.com/classes/class/2026-06-14-creative-phone-photography-chinatown-penn-quarter Learn smartphone camera settings for creative images. From essential techniques for exposure, to composition and focusing tips in this vibrant DC area. We begin outdoors at the National Portrait Gallery and then explore the surrounding Chinatown/Penn Quarter area with its quirky architecture and street scenes. The class will start with basic instruction on the operation of the native mobile phone’s camera. We’ll then cover some of the more advanced features of setting focus and exposure independently. We’ll explore how to turn the mobile camera’s limitations such as one lens, fixed aperture, no zoom and a small sensor to advantages using creative techniques of focus, exposure and composition. You’ll create pictures on an easily paced photo walk with guided instruction coupled with gentle critique and suggestions to make your pictures the best they can be. This class is designed for users of iOS and Android mobile devices. Participants will need to bring a fully charged phone. THIS CLASS IS BEING OFFERED THROUGH CAPITAL PHOTOGRAPHY CENTER https://capitalphotographycenter.com/classes/class/2026-06-14-creative-phone-photography-chinatown-penn-quarter

Mountains to plains to tropical beaches, Tanzania has it all. You will get an opportunity to let out the Tarzan in you through this experiential multi-day safari in Tanzania. Immerse yourself in nature and wildlife during our game drives at Manyara and Ngorongoro. You may also experiment with wildlife photography at Serengeti National Park. Enter the world of colorful coral reefs at Mnemba and swim along with the tropical fishes. End your trip at Zanzibar with a remarkable snorkeling and scuba diving experience. Highlights Visited Places: • Arusha • Lake Manyara • Serengeti National Park • Ngorongoro • Zanzibar • Prison and Spice islands • Mnemba Atoll Travel Experience: • Admire the wildlife at Lake Manyara • Enjoy a game drive at Ngorongoro crater • Enjoy the safari at Serengeti National Park • Discover the history of Zanzibar • Explore the Prison islands • Meet the giant tortoises at Changuu island • Learn more about local spices • Go snorkelling at Prison island • The Rock restaurant • Recline near the sandy beaches at Zanzibar • Snorkelling at Mnemba • Look for the ‘Big 5’ (elephant, rhino, buffalo, lion and leopard) Tour Start Kilimanjaro Tour End Zanzibar Flights • Arrival: Day01 before 12pm • Return: Day09 anytime after 12pm Airport: Kilimanjaro International Airport(JRO) Abeid Amani Karume International Airport(ZNZ) Itinerary Day01 Kilimanjaro – Arusha Day02 Lake Manyara Day03 Serengeti NP Day04 Serengeti - Ngorongoro Day05 Ngorongoro Crater - Arusha Day06 Zanzibar Day07 Prison & Spice Islands Day08 Mnemba Atoll Day09 Zanzibar Cost: Safari + Zanzibar (Double Occupancy) $3990 / person Safari + Zanzibar (Single Supl) $4590 (Single) Safari ONLY (Double Occupancy) $2990 / person Safari ONLY (Single Suppl) $3590 (Single) Inclusions Price Includes • All park and conservancy fees • Crater service fee • Professional Safari Guide and Driver • Accommodation as per the itinerary (Lodge / Camp) (Double Occupancy) • All meals during the Safari • 4×4 Safari vehicle • Zanzibar 4D/3N hotel stay, activities & transfers as per the Itinerary • ONE WAY FLIGHT: Kilimanjaro to Zanzibar – On Day06 Price Excludes • International Flights • Meals (other then mentioned above) • Personal Expenses • Tips and gratuities • Transfers other then mentioned in the Itinerary (available at extra cost) • Travel insurance / Visa ———————————————— For detailed itinerary and to reserve your seat follow the link below: [https://www.bucketlistgrouptravel.com/tour/tanzania-serengeti-ngorongoro-safari-with-zanzibar/](https://www.bucketlistgrouptravel.com/tour/tanzania-serengeti-ngorongoro-safari-with-zanzibar/) Questions? Text / Call - 2023787696 - Himanshu - Organizer

[https://ridewithgps.com/routes/43436538](https://ridewithgps.com/routes/43436538) 33 miles. Toilets at beginning, middle, and along the way. Lunch in Herndon at approx. 16 miles. Join us for a leisurely ride along the W&OD trail, one of northern Virginia's best bike routes. This is a regularly repeated ride because it’s easy. Parking is good, there are rest rooms, the path is not usually crowded, and it’s mostly flat and mostly paved. It is longish, but requires very little navigation. Our lunch break is near The Herndon Caboose which is located in the historic Town of Herndon, a small town that embraces its railroad past. Check out the Green Lizard Cycling & Coffee shop, or grab something at the bakery in town. We meet at 10:00 and leave at 10:15 from the south Bluemont Parking lot, The address listed above (which is the address of the house nearby) will get you to us. It’s just a minute after you cross route 50. This ride is about 33 miles but it’s mostly straight so you can turn around at any time and find your way back. If you would like to extend the ride, you can keep going past Herndon. Or ride past the return spot in Arlington to pick up one of the other bike paths that connect nearby. **NOTE : Please be careful on the road crossings since there are several small ones and a few busier ones. Gallows Road, for example, can be busy, but it does have a traffic light to help you cross.** Bring plenty of water! Bring snacks or grab something on the ride in Herndon. Someone will stay with the bikes. Pump your tires, charge your battery, and check your brakes before the ride. Consider carrying a spare tube. **THINGS TO KNOW:** The group stops a few times (certainly before tricky turns) for slower riders to catch up. We maintain polite bike path etiquette and are respectful of others using the path. As usual, non-assisted bikers are most welcome. For the E-Bike Lovers group to be successful, we need to grow our membership carefully. Please feel free to invite other E-Bike lovers spread the word, and let’s have fun! **We recommend that you download the Ride With GPS route to ensure your independence.:** [https://ridewithgps.com/routes/43436538](https://ridewithgps.com/routes/43436538) **Free Ride With GPS for E-Bike Lovers** The Ride With GPS E-bike Lovers club membership is now free as www.ebikelovers.com generates sufficient income from ads to cover the costs. Here is the link to activate your free membership: [https://ridewithgps.com/auto_approve/Club/6746/Zwa5jhttF5mJrFbN](https://ridewithgps.com/auto_approve/Club/6746/Zwa5jhttF5mJrFbN) **More information about using GPS files:** [https://ebikelovers.com/2021/03/15/download-our-trails-and-never-get-lost/](https://ebikelovers.com/2021/03/15/download-our-trails-and-never-get-lost/) **More information about e-bike ranges:** [https://ebikelovers.com/2020/12/31/e-bike-longer-and-happier-15-smart-strategies-to-reduce-your-e-bike-range-anxiety/](https://ebikelovers.com/2020/12/31/e-bike-longer-and-happier-15-smart-strategies-to-reduce-your-e-bike-range-anxiety/) **Your registration for this ride signifies your acceptance of the terms contained in the Disclaimer below.** **DISCLAIMER** LIMITATION OF LIABILITY: TO THE FULLEST EXTENT PERMISSIBLE PURSUANT TO APPLICABLE LAW, NEITHER GREGORY MAASSEN, NATHAN MERRIS, RICHARD CAMER, TRIP COORDINATORS, THEIR AFFILIATES, FAMILY AND FORMER AND CURRENT EMPLOYERS NOR ANY OTHER PARTY INVOLVED IN CREATING, PRODUCING, OR DELIVERING E-BIKE LOVERS GUIDES, OUR MEETUP EVENTS, AND THE GPS E-TRAILS IS LIABLE FOR ANY DIRECT, INCIDENTAL, CONSEQUENTIAL, INDIRECT, EXEMPLARY, OR PUNITIVE DAMAGES ARISING OUT OF A USER’S ACCESS TO, OR USE OF THE E-BIKE LOVERS GUIDES, OUR MEETUP EVENTS, AND THE GPS E-TRAILS. See for full disclaimer: https://ebikelovers.com/disclaimer

A soft afternoon of movement, creativity, strategy, and connection. Join us for a wellness centered gathering designed to help women slow down, recharge, and meet new people in a low pressure, intentional space. This DC fair will have: 🧘🏽‍♀️ Pilates & gentle movement ♟️ Casual chess + beginner-friendly tables 🎨 Art & creative stations ☕ Light bites, conversation, and community Whether you want to stretch, paint, learn chess, or simply exist around good energy for a few hours, you’re welcome here. For some reason the address wasn’t popping up in meetup but it’s 670 Rhode Island Ave NE, Washington, DC 20002. Send me a direct message on Meetup if you’re having an issue joining the WhatsApp group.

Open gaming at Panera! New players welcome. We have many games on hand or you can bring your own. We are happy to teach or learn one of yours.

Bring your Raspberry Pi, Arduino, microcontroller, or any other electronic project and join fellow electronics makers for a night of creativity and collaboration! This session is open forum to share your current projects—whether complete or in progress, it’s all interesting! Whether you’re deep into embedded systems, exploring new ideas, or just getting started, you’ll find a welcoming space to collaborate, share, and get inspired. **New to electronics or curious about tinkering?** You’re absolutely welcome. If you’re a beginner and want to experiment, I’ll have a couple of starter kits available so you can try things out—whether that’s blinking your first LED, putting something on a display, or experimenting with simple sensors. No pressure and no experience required—just an interest in learning and building. While we continue to pursue a more permanent venue for this Meetup, we’ll be using public library facilities based on availability. This session will be at the Worthington Park Library in the Olentangy Meeting Room.

**\*\*\* We've Moved! Bold Penguin - 6555 Longshore St, Dublin, OH 43017 \*\*\*** Ryan Carroll **Local AI in Rails: Fast, Cheap, and Predictable** Rails apps usually reach for external AI services when they need “intelligence,” but that approach can bring latency, cost, and unpredictability along for the ride. This talk shows a different path: running a Japanese sentiment model directly inside a Rails app, using ONNX Runtime, background jobs, and real-time updates to keep the user experience fast and responsive. Using a small app called **Sentiment Omikuji** as the case study, the talk walks through how the model was trained in Python, exported to ONNX, and loaded into Ruby for local inference. It also covers how Japanese text is tokenized, how the sentiment output drives a fortune generator, and why the app uses Solid Queue to keep model work off the request path. Along the way, the talk explores the tradeoffs of local inference versus API-based LLMs, and why classic machine learning can still be the right tool for focused problems. Attendees will leave with a practical architecture they can adapt in their own Rails applications, plus a clearer picture of when local AI makes sense, how to keep it predictable, and what it takes to make it feel good in a real app. **AGENDA:** * See updates to parking below * Doors open at 5:30, feel free to come and hang out before! * Official start of the meeting is at 6:30pm * After the meeting is done, we will go hang out at a nearby space in Bridge Park! If you can, please sign up via meetup by noon the day of the meeting so we can have an estimate headcount for food :) We always order extra, so feel free to join us even if you don't get signed up! Thank you to Bold Penguin for providing the food and location! **Parking & Arrival:** **Parking:** Parking in Bridge Park is free. The closest lots are the Mooney Garage and the Hotel/Endres Garage. **Entry:** The doors to the office are to the right of PINS. The street level door and elevators lock at 6pm. If you arrive after that, someone should be there to let you in, else call the number posted. Take the elevator to the 2nd floor. Once you exit the elevator, turn right. \*\*\* We are a bunch of professionals, students, and geeks who are excited about Ruby programming language ([http://ruby-lang.org/](http://ruby-lang.org/)) and Rails framework ([http://rubyonrails.com/](http://rubyonrails.com/)) and the joy they have brought back to web development. Our main goal is to share the love of the Ruby and Rails ecosystems with anyone that is interested. We cater to everyone, whether a non-programmer through advanced Rubyists. * We give lectures on programming topics * We freely provide decades worth of experience * For full details of this month's meeting please visit [http://columbusrb.com](http://columbusrb.com)

Over a billion documents processed. Millions of Veterans impacted. Hundreds of thousands of employee hours saved. Faster decisions. Greater accuracy. More benefits in the hands of our disabled Veterans. We created Smart Search, the world’s largest consumer of Amazon Textract, right when GenAI began reshaping what’s possible. Since then, we’ve built a suite of AI‑driven solutions that transform this data into real, measurable outcomes—accelerating benefits decisions for our Nation’s Veterans. Join us for a focused conversation on how an outcome‑driven approach to AI is helping us boost accuracy, streamline workflows, and deliver faster results for those who have served. This is a follow up to the AWS re:Invent 2023 "Intelligent Document Processing with Gen AI for Public Sector" presentation. About Speaker: Cameron Williams is a Senior Technical Project Manager and cross-functional technical leader at Booz Allen Hamilton with 15+ years of experience architecting and evolving scalable, cloud-native systems, from greenfield development to complex enterprise modernization. https://www.linkedin.com/in/cameronw711/ **THANK YOU** *Franklin University* for hosting our meetup! To learn more about *Franklin University*, please visit their website: https://www.franklin.edu/ **DIRECTIONS** Franklin University Fisher Hall 300 E. Main St, Columbus, OH 43215 Map: https://maps.app.goo.gl/jxjBA2hUmS5qrvhq8 Parking is FREE! Please park in Lot C in front of Fisher Hall. See attached map. NOTE: Map the address only. When mapping with Google Maps it may use the Fisher Hall at OSU, which is NOT correct. **Want to sponsor the pizza and/or bar tab?** Please contact me if you would like to sponsor this meetup's pizza and/or bar tab: angelo@mandato.com

This is an in-person meeting. Did you know that unwanted emotions like loneliness, sadness, hopelessness, anger, fear, anxiety, or feelings of irritation don’t just fall on you for no reason. They are not random occurrences that simply happen to people's minds. They are definitely not chemical imbalance in your brain due to some nebulous chemical reactions by chance. Your negative emotions are the symptoms of the painful experiences that you have which are not healed, and which are still affecting you. The effects of these painful experiences are exacerbated by the pressures or difficulties of the other problems in your life. For instance, let's say you are already carrying a huge load on your back, then you cannot take on much more, but, let's say something else happens to you, such as the difficulties from the Pandemic, then the resultant combined weight on you can take you over the edge, kind of like the straw that break the camel's back. When this happens, people's attention usually goes to the straw that was added, but actually the majority of the weight had come from the huge load that were already there, holding a person down and causing a person issues. So how do you remove the huge load that was already there? How do you lighten them up? Is it possible to get rid of them? That is what this meeting will be all about. Come to our Meetup, where we can introduce you to some of the knowledge, tools and techniques of the breakthroughs in the field of the mind that we can apply to this ever important area of life. Be sure to click on the red "Attend" button below to come to this local event. We look forward to seeing you there. This group is created by the Dianetics and Scientology Life Improvement Center of Central Ohio.

Title: Smart Search + AI: An Outcome-Driven Journey from IDP to a Suite of AI Register at the Columbus AWS meetup: [https://www.meetup.com/columbus-aws-amazon-web-services-meetup/events/313426379/](https://www.meetup.com/columbus-aws-amazon-web-services-meetup/events/313426379/) Over a billion documents processed. Millions of Veterans impacted. Hundreds of thousands of employee hours saved. Faster decisions. Greater accuracy. More benefits in the hands of our disabled Veterans. We created Smart Search, the world’s largest consumer of Amazon Textract, right when GenAI began reshaping what’s possible. Since then, we’ve built a suite of AI‑driven solutions that transform this data into real, measurable outcomes—accelerating benefits decisions for our Nation’s Veterans. Join us for a focused conversation on how an outcome‑driven approach to AI is helping us boost accuracy, streamline workflows, and deliver faster results for those who have served. This is a follow up to the AWS re:Invent 2023 "Intelligent Document Processing with Gen AI for Public Sector" presentation. About Speaker: Cameron Williams is a Senior Technical Project Manager and cross-functional technical leader at Booz Allen Hamilton with 15+ years of experience architecting and evolving scalable, cloud-native systems, from greenfield development to complex enterprise modernization. https://www.linkedin.com/in/cameronw711/ **THANK YOU** *Franklin University* for hosting our meetup! To learn more about *Franklin University*, please visit their website: https://www.franklin.edu/ **DIRECTIONS** Franklin University Fisher Hall 300 E. Main St, Columbus, OH 43215 Map: https://maps.app.goo.gl/jxjBA2hUmS5qrvhq8 Parking is FREE! Please park in Lot C in front of Fisher Hall. See attached map. NOTE: Map the address only. When mapping with Google Maps it may use the Fisher Hall at OSU, which is NOT correct. **Want to sponsor the pizza and/or bar tab?** Please contact me if you would like to sponsor this meetup's pizza and/or bar tab: angelo@mandato.com

🎳 **Summer Fun Starts on the Lanes! 20% off for NEW bowlers!** The 6-week summer social bowling league is here - cold drinks, fun times, and new friends await on the lanes! Whether you're looking to meet new people, unwind after work, or just have a fun weekly outing, this league is for everyone. Social vibes, happy hour energy, and plenty of chances to connect with others. No matter your skill level, this league is all about having fun and meeting awesome people. ;) **🗓 Thursday nights \|📍 AMF Sawmill Lanes \| 💵 $74 *(while Early Bird is active)*** **🚨New to the league?** Use discount code (**MUSU26**) for 20% off - $59.20 *during **Early Bird*** **💻 League Info & Registration**: https://bit.ly/ColumbusBowling **Why Join?** 🎉 It’s only 6 weeks - perfect for a low-commitment social plan 🍻 Great mix of people in their 20s, 30s, & 40s, plus post-game hangs at the bar 🎳 Zero pressure - gutter balls totally welcome! 👕 Free league shirt if you sign up early 🧠 Weekly trivia w/ prizes 💬 Super social - join solo or w/ friends! **Want in?** Join our Meetup team Gutter Domination 👉 **Click here to join** https://tinyurl.com/2awfupnc Or start a team of your own with a few friends - we’ll all be hanging out either way! 📅 League Dates (Thursday nights): June 25, July 2, July 9, July 16, July 23, July 30 ***(The MeetUp event date is deadline to register for the league.)*** **Cost & What’s Included:** ✔ $74 **Early Bird** registration - **New bowler? Get 20% off w/ code: MUSU26** ✔ 6 weeks of bowling (1–3 games/week) ✔ Shoe rentals & full league setup ✔ Trivia, prizes, and great people 👉 **Sign up now:** 💻League Info & Registration: https://bit.ly/ColumbusBowling 🤑New bowlers use code MUSU26 to save 20% 📸 Follow the fun on Instagram: https://bit.ly/BowlingLeague-IG 📩 Questions? Contact the league: http://bit.ly/2nKHno7 Spots are filling fast – don’t miss out on the fun times!

## 🤝 Host Information A co-hosted event by ProductTank Columbus & Women in Product Columbus 💡 About the Workshop AI adoption is stalling across organizations — not because of a lack of motivation or tools, but because it's fundamentally a behavior design challenge. This hands-on workshop applies proven Behavior Design models and methods to help you move from a vague organizational wish to boost AI adoption to 3-5 concrete, testable interventions you can act on starting tomorrow. Whether you're a product manager, on a product team, or just someone trying to get AI to actually stick at work, you'll leave with a clear picture of what's worth focusing on, what to ignore, and how to drive real, sustained adoption — no guesswork required. 🛠️ What to Bring Laptop: Fully charged and ready to go. AI Assistant: Have your favorite AI assistant pulled up. (Dom will be using Claude, but feel free to use whichever assistant you prefer!) 🍕 Logistics & Perks Food & Drink: Pizza and drinks provided! Parking: Plenty of free spaces available on-site. ###