Concurrency

A low cost, 6-week intermediate-level **中文** (Mandarin Chinese) course with the non-profit organization, the Global Language Network. \#\# Chinese \(Mandarin\) Frequent Flyer Language Class **Details:** \#\#\#\# Chinese \(Mandarin\) Frequent Flyer with Alex Tuesdays from 6:00pm - 8:00pm ET Apr 7th to May 12th In-person, Farragut Square DC * GLN classes are open to everyone over 18 years of age. * Have a credit or stipend to apply to your payment? Learn more about our credit, stipend, and refund policy on the [Pricing & Course Levels page.](http://%5B%5Bhttps://thegln.org/pricing-%26-course-levels%5D%5D(https://thegln.org/pricing-%26-course-levels%5D)(%5Bhttps://thegln.org/pricing-%26-course-levels%5D(https://thegln.org/pricing-%26-course-levels))) Ready to learn? **Register [HERE](http://%5B%5Bhttps://docs.google.com/forms/d/e/1FAIpQLSem9IdJEYqsE91SvfEEjIe8FuvoAjOusgE2ab_qkvm3apyjzg/viewform%5D%5D(https://docs.google.com/forms/d/e/1FAIpQLSem9IdJEYqsE91SvfEEjIe8FuvoAjOusgE2ab_qkvm3apyjzg/viewform%5D)(%5Bhttps://docs.google.com/forms/d/e/1FAIpQLSem9IdJEYqsE91SvfEEjIe8FuvoAjOusgE2ab_qkvm3apyjzg/viewform%5D(https://docs.google.com/forms/d/e/1FAIpQLSem9IdJEYqsE91SvfEEjIe8FuvoAjOusgE2ab_qkvm3apyjzg/viewform))).** **About GLN** We are a Washington, DC-based 501(c)(3) non-profit organization with a mission to "Use Language as a Tool to Help Fix Our World." Since 2015 we have been rated #1 Best Language Classes in Washington, DC by Yelp! We are so happy and grateful to have you join our network and we appreciate your support of our mission.

Everyone is welcome to attend our weekly happy hour, at Tony & Joe's Waterfront Bar in Georgetown (3000 K. St, NW). The event goes from 7:15 to around 10:00 PM. Feel free to show up at any time. French speakers of all levels- from beginners to expats- are invited. We hope to see you there!

[Book Your Ticket Here on our Website](https://crowndancestudio.com/group-classes/). This Class is for anyone who's taking some beginner classes and is considering leveling up. When?: Tuesday Level 2 Salsa Group Classes 7:00PM to 8:30PM. Do I need Partner? NO Is it a Series? No. But we review similar materials on the consistent basic. So having a good basic foundation in those dances will go a long way for you here. Cost: $25 Per Person for 90 minutes class Can I drop-in? Yes. Membership & Class pass available for your better growth and progress. www.crowndancestudio.com

Please join us every week for power networking! Our Chapter Passed $1,666,736 USD in the past 12 months! BNI members, on average, increase their business 20% the first year. Our chapter is a dynamic, committed group of business people who know how to refer business to each other. Come for our meeting -- stay for the referrals!!! We have open categories for individuals who will bring enthusiasm and integrity to our meeting. Just one person per professional specialty is allowed in each chapter. Visit a meeting to find out more and lock out your competition! Register Here: https://bninovanorth.com/va-nova-north-bni-mclean-business-connection--n136/en-US/visitorregistration?chapterId=16988

Let's get together to play some fun BB level Doubles games at Bluemont. **Format**: Doubles **COST**: FREE **Court Type**: Outdoor grass **Minimum Skill Requirements**: Intermediate-BB (click [here](https://docs.google.com/document/d/1PojSi4qdlRsv1msCHhvpQ43iDc4FfzQwpWCc3kafVMY/mobilebasic) for details) \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **Smiley Social documents:** 1. [Group Rules ](https://docs.google.com/document/d/1HrG35p_0M08leRvCp8XWG3CMkr_GL928XFabl5T6Dvg) 1. [Liability Waiver ](https://docs.google.com/document/d/1W2mq-7m99lmvd7gdWYaSUFtvVg4UGnzV6koafAbHmco) 1. [Volleyball Levels](https://docs.google.com/document/d/1PojSi4qdlRsv1msCHhvpQ43iDc4FfzQwpWCc3kafVMY/)

Join the DC Portuguese Conversation Group at Courthaus Social in Arlington for an evening filled with Portuguese practice. **This is our first event in Virginia!** Build new connections and broaden your cultural/lusophonic horizons with us! Whether you are a native Portuguese speaker, an English-speaking expat looking to practice Portuguese, or simply interested in making international friends, this event is perfect for you. (IF YOU ARE STILL LEARNING THAT IS FINE, ALL LEVELS WELCOME). Come ready to engage in stimulating conversations, make new connections. Ate ja, tchau!

We’re excited to continue building AI in Practice with our monthly social! 🎉 Each month, we’ll host an informal happy hour and dinner at Upside on Moore in Rosslyn. Come join fellow AI builders, professionals, and curious minds for a relaxed evening of conversation, connection, and community. Whether you’re working on AI systems, advising on responsible adoption, or just interested in how AI is shaping law, compliance, finance, healthcare, defense, software, mission-driven organizations, or public service — this is a chance to meet like-minded people and help shape what this community becomes. 🍸 Drinks and food are available for purchase at the venue. 🤝 No formal agenda — just introductions, networking, and sharing what excites us about AI in practice. We’re so grateful for the early enthusiasm, and we look forward to seeing you each month as this community grows! **Date, Time & Location** 5:30 PM – 7:30 PM Tuesday 14 April 2026 Upside on Moore 1831 Moore Street Arlington, VA 22209

Title: Foundations of Localized Symmetry Mathematics Date: April 18 2026 Noon - 14:00 EST Summary: The moment you use Euclid’s definitions of points and distances in any of your mathematical axioms, all that follows is assured to produce some level of nonsensical results when applied to the foundations of physics. The reason is not complicated: Euclid’s definitions are deeply mired in accepting as a “given” the very concepts that emerge only in well-defined inertial frames, which in turn are local instances of symmetries that are always finite and context dependent. In this talk, Terry will discuss how reframing mathematics in terms of symmetries that, as in the real world, are finite, composite, and dependent on self-observation (acceleration), results in a richer and far stranger set of mathematics in absolute conservation of quantum numbers generate local and global symmetries — the opposite of Noether’s theorem — that in turn create the emergent classical phenomenal such a particles, fields, space, and time. Speaker: Terry Bollinger is a computer scientist with BS, MS, and professional degrees from the Missouri University of Science and Technology.

Food has always been one of the most powerful ways to bring people together. Join Interfaith Connections at the Table, a relaxed multi-faith meal where participants from different spiritual and cultural backgrounds gather to share food, conversation, and stories. We willl explore how food, tradition, and hospitality shape our identities and values — all in a warm, welcoming environment. There will be light facilitation and optional reflection prompts, but the focus is on connection, not programming. What to Expect: * Shared meal at a local restaurant * Interfaith-friendly, inclusive atmosphere * Conversation about culture, faith, and community * No speeches, no pressure — just presence Important Notes: * Attendees cover the cost of their own meal * Space may be limited based on reservations Location: [Dolan Uyghur Restaurant](https://www.dolanuyghur.com/), 3518 Connecticut Ave NW, Washington, DC 20008

Looking forward to seeing you! Please know that you don't have a reserved spot until you register at [Eventbrite](https://www.eventbrite.com/e/speed-dating-for-autistic-adults-tickets-1982622638683?aff=oddtdtcreator&fbclid=IwY2xjawP1rHJleHRuA2FlbQIxMQBzcnRjBmFwcF9pZBAyMjIwMzkxNzg4MjAwODkyAAEe09Q_4uRXeVchWzuAfDhgFlwnANLaOOKGr1stjbTaw5QD9gQXLos5IOBPUQs_aem_XUyVMTIlkYCPy8pVfz533Q) and purchase your ticket. Limited tickets available. Join us for a supportive, structured Speed Dating event for autistic adults (ages 25 to 40) on Sunday, April 19, 2026, from 2:00 to 4:00pm in Bethesda, MD (address provided after registration). This facilitated event is designed for heterosexual pairings and offers a welcoming, low-pressure environment to meet potential partners. Light refreshments will be provided. Registration is $35 on our website and free for our **[Constellations](https://www.harringtonmatchmaking.com/constellations-membership)** members.

meet at Tysons Corner Mall Upper Level Food Court

To secure your spot, purchase your ticket from the Eventbrite link ([https://www.eventbrite.com/e/speed-dating-21-39-years-olds-tickets-676171897347](https://www.eventbrite.com/e/speed-dating-21-39-years-olds-tickets-676171897347)). RSVPing only on the Meetup page, doesn't allow you to attend the Event. ABOUT THE EVENT Come meet your Soul Mate! We have lots of success stories. Our Speed Dating Event is just like a happy hour. It is structured and with purpose. So, come relaxed, natural and be ready to have fun. As usual we will try to make it a low pressure event. The only huge favor we ask from you, is to be on time. Ticket price includes a COMPLIMENTARY DRINK! Ticket price : $15 (will increase soon) NOTES : 1. We mingle and socialize for the first half hour. 2. We will give each couple 3 minutes seated interaction time. 3. After we finish the rotation, the party continues at the cash bar. 4. Since we paid for the venue, it is non-refundable. However, we will refund fully if the event is cancelled. 5. The payment secures serious and committed people and it is subject to increase. 6. RSVP will be open up until matches between sexes evens up. However, RSVP doesn't guarantee attendance, unless you buy your ticket. We constantly update the RSVPs. 7. If you are not able to attend you can sell your ticket to same sex. 8. For the dating session, we seat one man across from each woman. Then, we rotate each man to the next woman, until each man has met each woman present. Please try to speak loud, since everyone would speak at the same time. 9. After the 3 minutes time is up, you will then secretly circle yes or no on your date card depending on whether or not you would like to get to know the person you just met better. 10. Then, we will do the matching right after the event and will send you the result by email. 11. Address will be sent to ticket holders on the day of the event. Payment Instructions : 1. Login to see the 'Get Tickets' button, after RSVPing. Then hit the button. 2. Verify correct dollar amount for number of people you're paying for. 3. **If you don't have a Paypal account, click "Pay with a Debit or Credit Card".** 4. If you have a Paypal account, simply log in, and pay as you normally would via Paypal. **How to Unblock the Pop-up Blocker on Your Phone** Many of our patrons advised us that they have a Pop-up Blocker on their iPhones and they hinders them from buying tickets. To unblock, please follow the following steps : For Safari Users : 1. Go to Settings 2. Scroll down to Safari and click on it 3. Select Block Pop-ups and turn it off. For Google Chrome Users : 1. Open Google Chrome. 2. Click on the three dots and you will see many options. 3. Click on Settings. 4. Scroll down to content settings. 5. Select Block Pop-ups and turn it off. Refund & Ticket Resell All sales are final. We only refund the full amount, if the event is canceled. If it is rescheduled, we will send an email to ticket holders advising that. A full refund will be given to those that let us know within 2 calendar days of the update email, if you are unable to make it on the new date. No refunds will be given after that time. However, you can sell your ticket to someone else if you are unable to attend. Please, feel free to post in the comment box for the event, that you have a ticket for sale. Work out payment between yourselves, and have the seller only send the organizer a message letting us know the full name of the person taking your spot. You must let us know two hours before the RSVP close time, on the day of the event. **FOR FURTHER INFOR, REFER THE EVENTBRITE LINK. IT RULES.**

​This meetup is for anyone building with OpenClaw (& Claude Code) or experimenting with other AI tools to create agents that can act and make decisions on their own. If you haven’t tried these yet, come hang out, ask questions, and see what others are building. We’ll trade notes, troubleshoot setups, and explore what it takes to run these systems openly on the web instead of inside closed platforms. Bring your laptop, grab some power, and jump into a night that feels part LAN party, part live build session, where people test ideas and show what their agents can actually do. 👉 [RSVP on LUMA](https://luma.com/53dx7no1) We’ll also have some fun by running a live test to see if a few of our agents can send Bitcoin back and forth and talk about why that’s a meaningful step for autonomous AI. It’s a chance to connect the dots between open AI tools, Bitcoin, and the wider goal of creating technology that no one can turn off. 👉 [RSVP on LUMA](https://luma.com/53dx7no1)

♠️😲♠️ W.O.W. Spades Night ♠️😲♠️ Washington on Wednesday (W.O.W.) - 3rd Wednesday Spades in DC 🌟Spades in DC! 😀 Hang out with a friendly and welcoming group. Meet new people and have a great time! ✅️ No partner needed! Find one onsite. All skill levels are welcome. 📌 Nando's Peri-Peri Chicken - Navy Yard 300 Tingey St SE #150, Washington, DC 20003 ❤️ **Posted in multiple groups. So, expect a nice crowd.** 🚌 One block from Navy Yard Metro Station 🚗 Street and Garage Parking available. 🍷 Alcoholic beverages are available! 🍗 Please support the business by purchasing food/drinks. 🌟 The fun starts at 5:30pm! RSVP today.

Let’s reboot the DC Postgres Meetup series! This inaugural meeting will be hosted by John Porvaznik and Eddie Pickle and all are welcome. We’re actively looking for speakers, co-hosts, event spaces and other folks that want to help bring this group back to life. If you can’t make it but want to be involved in the future, please let us know. John Porvaznik will present a talk on Postgres fundamentals including shared buffers, memory usage, pages, and more. John is a long time PostgreSQL Engineer and DBA in the government space with focus on ETL / Data Ingestion, PostGIS and spatial data sets, query optimizations, Database Design // DDL, benchmarking and specifications, data health, and system healths and monitoring. This meetup will be hosted near the Snowflake office in Tysons (event space sponsored by Snowflake). We’ll have pizza and drinks for folks. 6:00 arrival and networking, 6:30 talk followed by discussion, 7:45 close. The event is at 1750 Tysons Boulevard, McClean, VA, 22102, in the 1750 Tysons Conference Center. This is Metro Accessible from the Silver Line to Tyson's Corner station. Parking at the mall next door is free or the event building has paid parking.

Looking for a quiet, focused space to write? Come be part of our writing group—a dedicated time just for writing alongside fellow writers in your community. No readings, no critiques, no peer-review—just you writing within a supportive atmosphere. 6pm-6:15pm: Find your seat, set up your writing station, quick intro's. 6:15pm-7:45 pm: An hour and a half of silent focused writing. 7:45pm-8pm: Quick debrief, pack and head home. Can't wait to see you! :) Disclaimer: Shut Up & Write! is not affiliated with the Loudoun County Libraries or any other entity.

Please join us every week for power networking! Our Chapter Passed $1,666,736 USD in the past 12 months! BNI members, on average, increase their business 20% the first year. Our chapter is a dynamic, committed group of business people who know how to refer business to each other. Come for our meeting -- stay for the referrals!!! We have open categories for individuals who will bring enthusiasm and integrity to our meeting. Just one person per professional specialty is allowed in each chapter. Visit a meeting to find out more and lock out your competition! Register Here: https://bninovanorth.com/va-nova-north-bni-mclean-business-connection--n136/en-US/visitorregistration?chapterId=16988

Looking for a quiet, focused space to write? Come be part of our writing group—a dedicated time just for writing alongside fellow writers in your community. No readings, no critiques, no peer-review—just you writing within a supportive atmosphere. 6pm-6:15pm: Find your seat, set up your writing station, quick intro's. 6:15pm-7:45 pm: An hour and a half of silent focused writing. 7:45pm-8pm: Quick debrief, pack and head home. Can't wait to see you! :) Disclaimer: Shut Up & Write! is not affiliated with the Loudoun County Libraries or any other entity.

We are a group of professionals who share business strategies, refer business, and act as a sounding board to our members. Our business group is Clifton/Fairfax-based. We meet on the third Wednesday of the month. We start every meeting with informal networking and then move to the more formal agenda of the day. The agenda includes the topic of the day, discussion of the topic, then business needs and wants, and finish with success stories. We are looking for experienced business professionals and business owners who see value in networking with like-minded professionals and are dedicated to growing their business and helping other group members grow theirs. If this is you, we'd love to connect!

NOVA Code and Coffee is an inclusive, informal, co-working session. People of all skill levels are invited. The concept is simple, bring a laptop and ideas, we'll provide the coffee and donuts! Here's how it works: 1. At 10:15 everyone introduces themselves and briefly describes what brought them to Code & Coffee today (project, homework, networking, etc) 2. For the rest of the day, folks work in the communal space on their projects providing one another help and conversation as needed. Oh and they usually drink coffee and tea too! That's it! Hope to see you there! **Location** Our hosts are the Fairfax City Economic Development Building: [10300 Eaton Pl, Fairfax, VA 22030](https://www.bing.com/ck/a?!&&p=d7298231ca2df594df822003f9a93517c788fceefe1fcbb79c8976696e341bc6JmltdHM9MTc1MzIyODgwMA&ptn=3&ver=2&hsh=4&fclid=180d0745-3b7f-69a1-23a2-11433a7868e5&u=a1L21hcHM_Jm1lcGk9MTA5fn5Ub3BPZlBhZ2V-QWRkcmVzc19MaW5rJnR5PTE4JnE9RmFpcmZheCUyMENpdHklMjBFY29ub21pYyUyMERldmVsb3BtZW50JnNzPXlwaWQuWU44NzN4ODI4MTk2Mjg0NTk5MDM4MTU0MiZwcG9pcz0zOC44NjE0NDYzODA2MTUyMzRfLTc3LjMwMjE3NzQyOTE5OTIyX0ZhaXJmYXglMjBDaXR5JTIwRWNvbm9taWMlMjBEZXZlbG9wbWVudF9ZTjg3M3g4MjgxOTYyODQ1OTkwMzgxNTQyfiZjcD0zOC44NjE0NDZ-LTc3LjMwMjE3NyZ2PTImc1Y9MSZGT1JNPU1QU1JQTA&ntb=1) Conference Room A- Large, Floor 1 This is a new venue for us, so give us some time to get more details about it. Driving is the best option. There is plenty of free on-site parking. Otherwise, we are a 22 minute bus from the Vienna Metro Station. Bicycling from Vienna is possible but difficult, though once you are here, there's a bike rack in the garage behind the building, and there's also a Capital Bikeshare dock 15 min walk away. **Sponsored by:** Thank you [Fairfax City Economic Development](https://gofairfaxcity.com/) and [Mason Enterprise Center](https://enterprise.gmu.edu/) for making this event possible! **Thank you so much to our wonderful sponsors!** Organized by [DMV Petri Dish](https://www.dmvpetridish.com/) **[Code of Conduct](https://github.com/NoVACodeCoffee/admin/blob/master/code-of-conduct.md):** We value the participation of each member of the community and want all attendees to have an enjoyable and fulfilling experience. To make clear what is expected, all delegates/attendees, organizers, and volunteers at any Nova Code & Coffee events are required to conform to our [Code of Conduct](https://github.com/NoVACodeCoffee/admin/blob/master/code-of-conduct.md).