Less Wrong meetups (deprecated)

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This page is deprecated.

Please use the new LessWrong community page

Old content, here for historical curiosity:

Less Wrong members sometimes arrange meetups to meet each other in meat space. Some geographic areas have groups that do this regularly. This list also includes some virtual/online meetups. See also Less Wrong meetup group resources.

Related listings elsewhere:


Albany, NY

Ann Arbor, MI

The Ann Arbor Area Amalgam of Rationalist-Adjacent Anthropoids has a Google mailing list and website.

  • Meetings every other Saturday, from 16:00 until about midnight. Usually near downtown Ann Arbor.

Last updated: 21 January 2017

Atlanta, GA

Last updated: 15 July 2017

Last updated: 26 September 2019

Austin, TX

Last updated: 15 March 2017

Baltimore, MD

Last updated: 27 November 2016

Bay Area, CA

  • There is an umbrella site at BayRationality.com for finding local rationalist people and events. This site is not currently being updated and some information may be out of date.
  • Mailing list: BayAreaLessWrong


  • Meets every Thursday evening at 7pm
  • Meetings are at the Berkeley REACH, at 3045 Shattuck Ave, Berkeley (first floor)
  • For meetup announcements, see the Bay Area Less Wrong mailing list.

Last updated: September 1, 2018

San Francisco

Last updated: 15 July 2017

South Bay / Mountain View

Last updated: 27 May 2019


  • Has not had a meet up in a while
  • Mailing list: lw-sf


Boston, MA

  • Cambridge Less Wrong
    • Facebook : [2]
  • Boston Effective Altruism

Last updated: 17 Aug 2021

Buffalo, NY

  • Buffalo LW meets irregularly to play games and have discussions. Visit the FB group page for up to date information. The Facebook group also acts like a nice portal for sharing thoughts and asking questions, so feel free to join even if you don't think you can attend meetups.
  • Facebook Group
  • Contact: Email Buffalo LW

Last updated: 25 July 2017

Chicago, IL

Last updated: 15 July 2017

Columbus, OH

  • Columbus Rationality is on hiatus. Gatherings of rationalists still occur - to get connected to the community contact AdAstra.
  • Columbus Rationality is a very active group. We hold workshops every 1st and 3rd Monday of the month at 7:30 PM, in the HCCO office. We sometimes hold social gatherings on the 5th Monday of the month.
  • Meetup page (posted under HCCO umbrella): [5]
  • Facebook group: [6]
  • Contact: AdAstra

Last updated: 3 May 2017

Denver, CO

  • Meets the first Tuesday of every month at 7 PM at 5151 E Yale Cir, Denver CO 80222. It's the club house area on the ground floor of an apartment complex, open directly to the outside/public.
  • Contact: Email Steven Zuber

Last updated: 16 September 2017

Fort Lauderdale, FL

Last updated: 24 July 2017

Las Vegas, NV

  • Inactive. Contact adamzerner [at] protonmail [dot] com if interested.

Last updated: 4 June 2017

Los Angeles, CA

  • We meet up at 7 pm every Wednesday at the Wine Bar next to the Landmark Theater in the Westside Pavilion (10800 W Pico Blvd #312, Los Angeles, CA 90064). Please join our google group and request an invite to the google hangout for topic discussion/etc.
  • Mailing List: Less Wrong Southern California Announcements
  • Facebook group (not very active; Google Group is primary channel of communication)
  • Calendar: SoCal LW Meetups

Last updated: 15 July 2017

Madison, WI

Last updated: 21 April 2017

New Hampshire

  • Meets twice/month on the second and fourth Tuesdays of each month at 7 pm at a private residence in Manchester.
  • Contact: Elizabeth Edwards
  • Facebook group: [7]

Last updated: 30 August 2017

New Haven, CT

New York City, NY

The NYC meetup group is very large and meets frequently. The NYC community was profiled here as a case study. Please join the mailing list!

  • Weekly, Tuesday, usually 7-11pm, Most often Private Residence, but varies (check mailing list)
  • Mailing list: Main Google Group

Philadelphia, PA

  • LessWrong Philadelphia meets irregularly. Join the mailing list to find out about upcoming meetups. We also have a Facebook group.
  • Philly Political Agnostics: rational, non-partisan discussion of politics; draws heavily from LW & SSC. Find out about upcoming meetups at the meetup.com page

Last updated: 10 September 2017

Phoenix, AZ

  • We meet irregularly on weekends at Hayden Library (In the middle of Arizona State University's Tempe Campus)
  • Contact: Danny_Hintze

Pittsburgh, PA

Last update: 24 July 2017

Portland, OR

Research Triangle, NC (Raleigh/Durham/Chapel Hill)

  • Mailing list: Research Triangle Less Wrong
  • Research Triangle LessWrong meetups are generally scheduled during the evening of the 1st, 3rd, and 5th Thursdays of each month. To be notified of future meetups (or to call one yourself!) please join the (very low-volume) RTLW Google group or keep an eye on our calendar.

Last updated: 24 July 2017

Salt Lake City, UT

Last updated: 25 July 2017

Seattle, WA

Other infrastructure:

Last updated: 2021-06-26

Washington, DC


Toronto, ON

  • Organization: Check on meetup.com
  • Typical Venue: Libraries or people's homes
  • Schedule: Thursdays
  • Contact: Giles Edkins [8] or Tuxedage [9]

All meetups are announced and organized on meetup.com.


  • LessWrong Waterloo has been on hiatus for several years, but there has been recent interest in restarting the group. Join the Google Group to find out more.
  • Mailing list: Waterloo Google Group

Last updated: 25 July 2017


Previous meetups have included presentations on books and discussions on HPMOR.

  • Mailing list: Ottawa Google Group
  • Meetup.com site: Less Wrong Ottawa will no longer be advertised on Meetup.com, though related Ottawa Skeptics pub events will cover the same interest group. If you are interested in RSVP'ing for the LW meetups, you can send a private message to user Swimmer963.

Nova Scotia

  • Venue: Private residence
  • Contact: [10]


We meet every week, usually somewhere in Kitsilano or downtown.

We do most of our organizing on the VanLWmeetup Facebook group and have a mailing list: Vancouver Rationalists


  • Time: varied
  • Frequency: at least once per week
  • Venue: the Macroscope
  • Groups: Facebook group, (the Google group is deprecated)
  • Contacts: Mati Roy (and Facebook or mathieu.roy.37@gmail.com)
  • Meetups Content: CfAR-inspired exercises, games, social meetups, celebrations, movie night, and other.

Last updated: 15 January 2018

Other relevant groups: Montreal Artificial Intelligence Ethics and Safety, Montreal Effective Altruism, Montreal Alliance for Rationalist Sharehouses (MARS), Montreal Cryonics


Vienna, Austria

  • Facebook group[11]
  • Meets every month
  • Contact Ratcourse to be added to the mailing list

Brussels, Belgium

  • This group is dead. If you would like to restart it, the Meetup.com group still exists.
  • The Brussels meetup group wiki page serves as a testament to the fact that there once was something here.

Last updated: 30 August 2017


Last updated: 1 August 2017

Prague, Czech Republic

Brno, Czech Republic

Copenhagen, Denmark

Last updated: 25 July 2017

Helsinki, Finland

Paris, France

Berlin, Germany

Cologne, Germany

Last updated: 1 August 2017

Frankfurt/Mainz, Germany

Hamburg, Germany

  • Mailing list: [12]
  • Contact: [13]
  • Schedule: possibly bi-weekly, alternating Friday and Saturday/Sunday

Munich, Germany

  • Meetup announcements on Meetup.com
  • Discussion and announcements (partly in German) also in Facebook group.
  • Schedule: Monthly (usually first weekend in the month, see announcements)

Budapest, Hungary

  • Venue: California Coffee Company Basilica (coffee shop), Szent Istvan ter 4-5. Link
  • Schedule: weekends, see mailing list.
  • Mailing list: BudLessWrong
  • Contact AlexeyM or katyusha

Milano, Italy

The Netherlands

  • LessWrong Netherlands
    • LW Netherlands meets every two weeks, on Sunday at 13:10 at Coffee Company Treub at Meester Treublaan 18, 1097 DP Amsterdam, Netherlands.
    • Find us on Facebook and meetup.com, or email Tim to get involved.
  • SlateStarCodex Amsterdam
    • SSC Amsterdam meets monthly at Cafe Batavia, Prinshendrikade 85. To accommodate people with different schedules, we alternate between holding meetups on Wednesdays and Saturdays. In odd-numbered months, meetups are held the first Saturday of the month at 5 PM. In even-numbered months, meetups are held the first Wednesday of the month at 7 PM.
    • Facebook group

Last updated: 4 August 2017

Kraków, Poland

Poznan, Poland

Warsaw, Poland

Moscow, Russia

Last updated: 1 August 2017

St. Petersburg, Russia

  • Schedule: Saturdays every week / every two weeks, 6pm.
  • Applied rationality workshop: vk event.
  • Regular meetings: vk community, vk event.
  • Meetup.com page.
  • Contact: v.e.evard@gmail.com, efim.wool@gmail.com.

Bratislava, Slovakia

Madrid, Spain

  • Effective Altruism and Rationality FB group: [16]
  • Contact: jsevillamol, pvs
  • Regular meetups beginning March 2017. If you would like to attend, please contact us.
  • Newcomers to the rationality community/ people who want to know more about rationality specially welcome.

Last updated: 9 Feb 2018

Stockholm, Sweden

Last updated: 21 April 2017

Zurich, Switzerland

Last updated: 1 August 2017

Kiev, Ukraine

Bath, UK

Bristol, UK

Rationality Cafe and Effective Altruism

A Philosophy Reading Group (Online)

Cambridge, UK

  • Schedule: Irregular times and places -- join the mailing list to see when something's going to happen, or to suggest a meetup.
  • Mailing list: CambridgeLessWrong

London, UK

Oxford, UK

As of September 2019, we're hoping to meet monthly, probably at The Gardener's Arms. See OxfordRationalish Facebook page for details


  • Oxford Rationality Meetups
  • Venue: Exeter College
  • Schedule: Saturday termtimes - normally 6-8pm.
  • Contact Larks or AlexFlint for details.



  • Australia-wide online meetups approximately once per month (currently on a Sunday around the middle of the month). Announced on the Less Wrong site and on the Facebook groups for Sydney and Melbourne. Upcoming meetups in 2015 are unplanned but are roughly bi-monthly.


Brisbane has not yet had an in-person meetup but they are growing as a facebook group, when we have enough interest we will organise a meetup. Brisbane Facebook group


  • Weekly on a Thursday 5-7pm. We alternate between a social week (boardgames, chatting etc) Then a more structured week.
    • Venue: Room 3.39 of the Hancock Library: [17]
  • Facebook group: Less Wrong Canberra
  • Records of previous meetups: [[18]]


  • Social Meetups – see the Facebook announcements. (Default: the fourth Friday night of each month, at a bar in the CBD.)
  • We sometimes organise impromptu social outings and excursions.

See our Facebook group for event details:

Last updated: July 2022

There is also Effective Altruism Melbourne – active as of July 2022: Meetup and Facebook. Activities include social fingers. Pre-pandemic There were regular co-working sessions (approx twice per month in late 2017).



  • General meetup on the fourth Wednesday of the month. Will include a combination of social and rationality-improvement exercises.
  • Rationality dojo on the first Sunday of the month. Focused on rationality improvement talks and exercises.
  • Irregular social meetups (whenever we come up with a good excuse) usually a fortnight after the main meetups
  • contact elo
  • Sydney's Lesswrong wiki page

Facebook group: https://www.facebook.com/groups/lesswrongsydney/

New Zealand


  • Schedule: Every second Sunday
  • Venue: Usually a discussion room in James Hight library (University of Canterbury)

Middle East

Tel Aviv, Israel

  • Schedule: Once every two weeks
  • Venue: Usually Google Israel offices (29th floor, Electra tower, Yigal Allon 98, Tel Aviv)
  • Mailing list,Facebook group

Last updated: 21 April 2017

South America

Buenos Aires, Argentina

São Paulo, Brazil

Last updated: 24 July 2017



Last updated: 25 July 2017

Tokyo, Japan

Last updated: 25 July 2017

Bengaluru, India

  • Facebook group
  • Schedule : 2nd Saturday of every month, subject to availability of members as on that day.
  • We have been meeting for more than 1.5 years now. Sound us out if anyone is interested.

Last updated: 14 May 2016


Australia mega-meetups

see Less_Wrong_meetup_groups#Australia

Chat networks


Blog posts

See also