MapReduce
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Frequently Asked Questions
Yes! Check out mapreduce events happening today here. These are in-person gatherings where you can meet fellow enthusiasts and participate in activities right now.
Discover all the mapreduce events taking place this week here. Plan ahead and join exciting meetups throughout the week.
Absolutely! Find mapreduce events near your location here. Connect with your local community and discover events within your area.
MapReduce Events Today
Join in-person MapReduce events happening right now
Doubles Volleyball, BB+ Level @ Bluemont
Let's get together to play some fun BB level Double 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)
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**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/)
Full Strawberry Moon in Old Town
This month's full moon is known as a Strawberry Moon because June is when strawberries are usually harvested.
Let's meet at the bike rack across the street from the King Street Metro Station and enjoy a full moon walk in Old Town!
NB: There is a Capital Bikeshare on Cameron St, across the street from the King St Metro, but that's NOT where we are meeting! Come to the Capital Bikeshare in between Joe Theismann's and Embassy Suites on Diagonal St.
❶ **What we'll do:**
* From the bike rack we'll walk south and east to Wilkes St, which we'll follow east through Wilkes St Tunnel to the waterfront. From there we'll walk upstream to the north side of Founder's Park and head west along Oronoco Street to Fairfax Street, walk south along N Fairfax St to King St, and then walk west along King St back to our starting point.
* The walk is a little over 3.5 miles and should take around an hour and a half. The surface is mostly paved throughout and fairly level.
* Google map: [https://tinyurl.com/psdd2s94](https://tinyurl.com/psdd2s94)
❷ **How to get there:**
* Metro: King Street Station is on the Blue and Yellow Lines. Current Metro status and alerts: [https://tinyurl.com/y7lklnl7](https://tinyurl.com/y7lklnl7)
* Driving: From I-395, take VA-7 / King Street east about 2.8 miles. Take the first right after passing under the railroad (Daingerfield Street), and an immediate right onto Diagonal Road. From US-1 / Richmond Highway, follow King Street west 0.5 miles, take a sharp left onto Daingerfield, and the first right onto Diagonal Road. There is free and metered parallel parking in the area.
❸ **Weather:** The forecast during our event is partly cloudy, temperatures in the low 80s, and a very slight chance of showers. Sunset is at 8:37 pm and civil twilight ends at 9:09 pm. The moon rises at 8:52 pm. Updates here: [https://tinyurl.com/yck2442z](https://tinyurl.com/yck2442z)
❹ **What to bring:** Water, comfy shoes, and your furry friend if desired (leashes, please). The streets are well lighted but you may want to bring a flashlight.
❺ **Advisory:** As a reminder, this is an adult group, and you are ultimately responsible for your own safety and well-being during events. No one under 18 years of age is allowed at this event, either as members or as guests, to include babies in carriers and/or strollers.
❻ **Administrative stuff:** There are restrooms at several commercial establishments along our route.
❼ **Notes:**
* Moonrise, Moonset, and Phase Calendar for Alexandria, June 2026: [https://tinyurl.com/4eya5rvx](https://tinyurl.com/4eya5rvx)
Walking Meditation (Saffron robe not required); conversation and lunch afterward
Oom.
Let's meet for a non-strenuous, easy outdoors walking meditation in nature.
We will discuss the why's and wherefore's of meditation, in general, and walking meditation, in particular. Then, we'll set out on a short (less than a quarter mile - 600 steps) mindful walk on a flat, level, graveled path.
Here are some guides to walking meditation:
https://www.nytimes.com/2026/02/28/well/move/tai-chi-walking-balance-longevity.html
https://taichiforhealthinstitute.org/tai-chi-walking/
https://www.womanandhome.com/health-wellbeing/tai-chi-walking/
If anyone has expertise in the subject, please step forward to lead the group.
We'll have lunch afterward at Jang Won Korean Restaurant, 4210 John Marr Drive, Annandale, VA 22003, closeby.
Secrets to Meditation: An Introduction to the Happiness Program
Discover the power of your breath to manage your mind and experience instant peace & calm.
Join a 60-minute free Workshop and get a glimpse of the Sudarshan KriyaTM-
The breathing technique that is revolutionizing the lives of millions.
What you’ll discover at ‘Beyond Breath’
✔ A taste of the Sudarshan KriyaTM, a breathing technique taught in the Happiness Program
✔ An instant energy booster that awakens & relaxes your mind - Take it home and practice daily!
✔ The peace & calm of a unique guided meditation
✔ Secret keys to manage your mind
✔ The power of surrounding yourself with positive, like-minded people.
You can use your breath to master your thoughts and emotions - the key to managing the quality of your day.
The Happiness Program
At the end of this workshop you may enroll into the Happiness Program (3 days, 3 hours each day) to learn the Sudarshan KriyaTM, a science-backed, rhythmic breathing technique through which you can:
Tap into a reservoir of energy and use it as you please!
Relieve deep-rooted stresses and anxieties
Uplevel your productivity
Overcome emotional blocks, move on from past events and shed limiting beliefs
Heal your body & gain power over your mind
Experience the true state of meditation
Learn more about the Happiness Program & the Sudarshan KriyaTM in our introductory workshop 'Secrets to Meditation'.
Instagram: artoflivingDMV
aolf.live/secretstomeditation
Read & Reflect: A Social Reading Circle.
Shared Pages, Shared Insights.
📚 Do you love reading, but wish you had a structure and a community to share your insights with?
Join our small circle of curious minds (just 4 members per gathering) as we come together for an hour of focused reading—in the calm setting of a library or the cozy atmosphere of a café.
Here’s how it works:
First part: Quiet reading on your own—bring a book you’re exploring, whether it’s philosophy, history, psychology, literature, or anything meaningful to you.
Second part: We regroup and each person shares key takeaways, insights, or questions sparked by their reading. This sparks a structured yet free-flowing conversation around ideas, perspectives, and personal reflections.
Why join?
Add structure to your reading habit.
Discover new books, authors, and ideas through others’ choices.
Build real connections by sharing and listening deeply.
Socialize around something meaningful instead of small talk.
MapReduce Events This Week
Discover what is happening in the next few days
Post AWS DC Summit: Meet the Community Evening
Join us for a special post-AWS DC Summit **“Meet the Community” evening** with **AWS DMV User Group** with special guest, AWS Principal Developer Advocate, Aaron Hunter!
This casual networking session is a great way to connect with fellow builders, cloud enthusiasts, and AWS community members after the AWS DC Summit. Whether you’re a student, developer, architect, or just curious about cloud, this is a perfect space to meet like-minded people, exchange ideas, and grow your network.
Expect light conversations, meaningful connections, and a relaxed atmosphere as we bring the community together after the big event.
📅 **Date:** July 2, 2026
🕠 **Time:** 5:00 PM – 8:30 PM
📍 **Venue:** Amazon HQ2, WAS19 2.103 + 2.104. 525 14th St S, Arlington, VA 22202
Looking forward to seeing everyone there and discussing the summit with great energy and conversations! Please RSVP with the same name as is on your state-issued ID, which will be required to check in at security.
From Glen Echo's Charm to the Majestic Great Falls with E-bike Lovers
[https://ridewithgps.com/routes/45899232](https://ridewithgps.com/routes/45899232)
26.1 miles. Lunch is at the Great Falls overlook 18.2 miles into the ride. There are toilets at Great Falls and Fletchers' Boathouse.
We will e-bike from Glen Echo Park in Maryland to the majestic Great Falls. We will be biking on the Capital Crescent Trail, the C&O Canal pathway, and McArthur Blvd with separate biking lanes. This tour captures the essence of adventure and natural beauty.
We will be meandering alongside the serene Potomac River and the C&O Canal, offering E-bike Lovers an unparalleled opportunity to immerse themselves in the lush landscapes that define this region.
Glen Echo Park, with its rich tapestry of cultural and artistic heritage, serves as the perfect prologue to a journey that gradually unfolds into the wild, untamed beauty of the Great Falls.
The route is just over 26 miles on gravel and asphalt. The gravel is compact. If you don't like the gravel on the C&O Canal pathway, this is not your route.
Entrance to the Great Falls National Park is for free as we enter from the C&O Canal.
We park at the large parking lot off Oxford Street, NOT at the smaller lot at McArthur Blvd.
Please bring snacks, lunch and plenty of water.
FYI: Ride With GPS E-bike Lovers Club membership is now for free as [www.ebikelovers.com](http://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)
The group stops a few times for slower riders to catch up.
**REMEMBER:** This is a self-guided event. This event empowers each participant to take the lead, as there are no designated bike leaders within E-bike Lovers. We all embrace the role of leaders in this self-guided experience.
Please RSVP only if you are coming so we know how many E-bike Lovers will participate. We enjoy a nearly 100% RSVP success rate.
Thank you so much for your help!
As usual, non-assisted bikers are most welcome.
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 the full disclaimer: https://ebikelovers.com/disclaimer
Cuban Salsa/Rueda de Casino Class & Social Dancing
Danceintime runs Cuban Salsa Classes & Social Dancing Every Saturday, all year-long. Come at 1:15 pm to sign in. Stay till 4 pm.
Some of us go out for coffee or a bite to eat afterwards and everyone is welcome!
$15/person. Cash, PayPal, Venmo, Apple Pay, or Card accepted.
Chevy Chase Baptist Church; 5671 Western Ave. NW; Washington DC 20015. NOTE: Enter through back corner door of the church.
Danceintime classes are great fun. The dance moves are beautiful, fun, and our class creates a bonded community... Check it out! Class will be held every Saturday in December....celebrate the holidays with dance!
For more info: danceintime.com/classes
Questions? Contact Barbbernsteintalks@gmail.com
A Poetry Workshop
Hey Poetry Lovers!
This group is on a roll. Here’s the gist:
We meet at the **Capital One Café in Chinatown** from **12pm - 2pm** every other week.
For enrichment, we start by reading and reflecting on a **“published poem”**, suggested by someone in the group. No advance preparation is necessary. But feel free to check out some of the poems we’ve read [here](https://docs.google.com/spreadsheets/d/e/2PACX-1vSyE_wCLQCPHRrKmN5F9tOIeeRQUZESxjRXGVBoCF2uU8Gm0_d0uECiCBCQXEy6ksxfsBOhtRIOpW3T/pubhtml?gid=0&single=true&widget=true&headers=false%22%3E%3C/iframe%3E). Or submit suggestions for future meetings [here](https://docs.google.com/forms/d/e/1FAIpQLSexGc2Z2Kp6bZW0D3_hfJ7NUUkfNHf7TXX-43FglCeBd9EF2Q/viewform?usp=send_form).
Next, we **share our work and offer feedback**. Depending on attendance, everyone gets \~10 minutes to use as they like. (No need to share, though; you’re welcome to come even if you prefer just to listen.)
We maintain a **Discord server** to help share our work and communicate outside our bi-weekly meet-ups. If you haven’t used Discord before, take a moment to download it and create an account before arriving. When we meet you on Saturday, we will add you to our server, the “DC Poetry Workshop”, and can help you navigate the app if you have questions.
Finally, if you plan on sharing a poem, consider how you will do so. Some options include:
* Print 5-10 copies to distribute in person
* Take and share screenshots in the Discord chat.
* Copy the poem into a google doc, change sharing settings to “anyone with link”, and copy the google doc link into the Discord chat.
Most importantly, we’re excited to meet you!
Catch you on Saturday,
Diego / Ian / Cayden / Nate / Otasha / Lia / An
Mid-Week Service
## **Mid-Week Service: Renew Your Spirit**
Join us every **Wednesday evening at 6:15 PM** for our Mid-Week Service, a dedicated time to pause, pray, and recharge in the middle of a busy week. Held in an intimate and welcoming setting, this service is designed to help you reconnect with God and find peace through His Word.
### **What to Expect**
* **Deep Biblical Teaching:** We move beyond the surface, engaging in verse-by-verse studies of Scripture—such as our current journey through the **Book of Acts**—to gain practical wisdom for daily life.
* **Community Prayer:** We believe in the power of collective intercession. Each week, we lift up the needs of our families, our city, and the world.
* **Heartfelt Worship:** A time of singing and reflection to center our hearts on the presence of the Holy Spirit.
* **Authentic Fellowship:** Connect with a supportive community of believers who are walking the same path of faith.
Whether you are looking for a deeper understanding of theology or simply a quiet place to sit at the feet of Jesus, our mid-week gathering offers the spiritual nourishment you need to finish your week with strength and purpose.
***
> *"But in your hearts revere Christ as Lord. Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have."* — **1 Peter 3:15**
Cruise: All-inclusive. Royal Caribbean. Bermuda.
Social Sips & Bites is setting sail in style! 🚢✨
Join us for an unforgettable escape filled with ocean views, elegant evenings, and island indulgence. The Bermuda await.
Exciting updates coming soon—keep an eye out!
6 Miles Hiking In Arlington
We will start at the Four Mile Run Trail Parking Area in Bluemont Park, follow the Four Mile Run Trail to Columbia Pike, then return and take the Lubber Run Trail to complete a 6-mile loop
Exact location to meet
[https://goo.gl/maps/mdHTq7ucwKdBpAH4](https://goo.gl/maps/mdHTq7ucwKdBpAH46)
Cost: Free
Walking speed: 2.5 -3 mph
Note:
We start on time, so please arrive early or on time to join the group
Dinner:
At the end of the walk, we’ll take a vote for dinner. If more than 5 people choose to join, we’ll go to dinner, otherwise, we’ll skip dinner
MapReduce Events Near You
Connect with your local MapReduce community
Stop Guessing: How to Measure and Improve LLM Outputs
Most people use LLMs by feel: ask a question, read the answer, decide whether it “seems good,” and move on.
That works for casual use. It does not work when you are building software, automating workflows, writing important documents, or relying on AI for anything that needs to be repeatable.
In this talk, we’ll look at how to improve and evaluate the inputs and outputs of LLMs using practical measurement techniques. We’ll cover how prompt changes affect results, how to compare outputs, how to build simple evaluation sets, and how math-based methods like similarity scoring can help you move beyond guesswork.
This will be beginner-friendly, so even if you don't know anything about AI, you should get something out of it. However, this will be a little more technical than our intro talks. You do not need to be an AI researcher, but programmers and technically curious attendees will get a lot out of it.
We’ll cover:
* Why “it looks good” is not enough
* How to improve prompts by changing the input, context, and constraints
* How to compare LLM outputs more systematically
* Basic evaluation techniques for accuracy, consistency, and usefulness
* How embeddings, cosine similarity, and scoring can help evaluate results
* Where automated evaluation works — and where humans still need to stay in the loop
By the end, you’ll have a practical mental model for treating LLMs less like magic and more like systems you can test, measure, and improve.
LOGISTICS AND PARKING:
The talk starts at 7:00 PM. The first half hour is reserved for everyone to get set up and mingle. Free pizza and drinks!
The cheapest parking option is to find street parking, which will only cost you a few bucks. Otherwise, park in the nearby veteran's museum lot for $8. It's highly recommended you avoid the nearby $15 garage parking.
Omnipresent Atheists Weekly Meetup
Jimmy V's Grill & Pub in Grandview Heights. You are responsible for your own meal/drinks. We usually don't have any agenda other than eat, drink and talk. :) If the weather is nice we will be on the back patio, otherwise we are in the cigar room.
This group has been meeting every Tuesday evening for over a decade. Many attendees do not RSVP on meetup. Please don't let the small number here discourage you. Anyone/everyone is welcome to come. We'd love to have you join us.
COTA bus #5 comes to W. 5th and Wyandotte Rd. And it's a minute walk to the restaurant.
Azure CBUS July
Want to be a speaker? submit your talk to our Call for Presenters!!!
https://sessionize.com/azure-cbus-2026/
In-Person Event: The Answers to Depression & Anxiety
This is an in-person meeting. At this meeting you will get answers to depression and anxiety. Find out the source of them and how to get rid of them.
Did you know that unwanted emotions like anxiety, depression, unhappiness, loneliness, hopelessness, anger, fear, 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 due to a chemical imbalance in your brain from some nebulous chemical reaction "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.
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 Hubbard Dianetics Foundation of Central Ohio and Church of Scientology of Central Ohio.
DoJo (Informal Python Meeting)
**Latest Dojo Location!**
**Knotty Pine Brewing**
1765 W 3rd Ave,
Columbus, OH 43212
We're going to try a new dojo location for a few weeks and see how it works
Dojos are informal Python group study sessions where everyone interested in Python gathers to learn about Python, help others with Python, or just hang out. Everyone is welcome from Python beginners to experts. Bringing a laptop is encouraged (we'll have extension cords and power strips). If there's something you want to learn leave a comment on this invite so we can plan ahead.
We're looking for speakers for our Monthly Meetups! Fill out the form if you are interested in presenting to the Python Community.
https://forms.gle/ehSfUAC2WgR34Crq9
Picnic with a Purpose: Real Estate Networking That Actually Pays Off
(Note: RSVPing here on meetup does NOT reserve your seat. To do that, you’ll need to register at our website, [HERE](https://www.coreerocks.com/Events.aspx?ID=Picnic-with-a-Purpose-Real-Estate-Networking-That-Actually-Pays-Off-14-7-7-2026).)
Real estate is a proven wealth-builder—it has been for generations.
But it’s not a solo sport.
You need PEOPLE—who can advise you, partner with you, bring you deals, and buy deals from you.
We’re all about bringing you the best, most active, most got-your-back people in Central Ohio, which is why our July meeting is all about real conversations with real investors at our annual Picnic with a Purpose.
This is where:
* Deals get discussed
* Partnerships get formed
* Funding relationships start
* Problems get solved faster
Bring your family. Build your network. Strengthen the relationships that actually move your business forward.
Members and first-time guests are free. Returning guests are $35.
Location is a local park and will be shared after registration.
Space is limited, so you’ll want to secure your spot now.
Remember, to actually reserve your seat, you
have to go [HERE](https://www.coreerocks.com/Events.aspx?ID=Picnic-with-a-Purpose-Real-Estate-Networking-That-Actually-Pays-Off-14-7-7-2026) and register on our website!
Cocoaheads
We have moved to guild.host. Look us up there.
https://guild.host/events/buckeye-cocoaheads-rcavwd






























