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Join the 12th Less Wrong Community Weekend (LWCW) in Berlin. This is the world’s largest rationalist social gathering which brings together 250+ aspiring rationalists from across Europe and beyond for 4 days of intellectual exploration, socialising and fun.

We will be taking over the whole hostel with a huge variety of spaces inside and outside to talk, relax, dance, play, learn, teach, connect, cuddle, practice, share ... - simply enjoy life together our way.

We are very honored to host 2 keynote speakers:

🧬 Michael Levin (online) – Biology Professor known for his understanding of cell bioelectricity as distributed intelligence whose manipulation promises astonishing results such as induced limb regeneration in frogs or reversing tumor malignancy. Also co-discoverer of Xenobots, living robots made from frog skin cells, and discoverer of the molecular-genetic mechanisms that allow embryos to form consistently left-right asymmetric body structures in a universe that does not macroscopically distinguish left from right.

🧠 Kaj Sotala – Rationalist writer, AI safety researcher, cognitive science communicator and fiction writer. Known for his reflections on the use of LLM, his work on emotions, parenting, his multiagent model of the mind, and how humans (and AI) make sense of the world.

We invite everyone who shares a curiosity for new perspectives to gain a truthful understanding of the world and its inhabitants, a passion for developing practices and systems that achieve our personal goals and, consequently, those of humanity at large as well as a desire to nurture empathetic relationships that support and inspire us on our journey.

The content will be participant driven in an unconference style: on Friday afternoon we put up 12 wall-sized daily planners and by Saturday morning the attendees fill them up with 100+ workshops, talks and activities of their own devising. The high quality sessions that others benefit most from are prepared upfront, but when inspiration hits some are just made up on the spot.

Previous years’ schedules have included…

Personal note from Henry: If things like ecstatic dancing, radical honesty and polyamory workshops sound too intense for you, rest assured everything is optional. I’m a nerd and very awkward so a lot of this stuff terrifies me.

The event takes place in the natural environs of Lake Wannsee on the outskirts of Berlin. So you can spend time recharging in between making new friends by hiking in the forests, sunbathing or swimming in the lake.

LWCW is family & LGBTQIA+ friendly. After past year's amazing experience we are increasing our effort into creating a diverse event where people of all ages, genders, backgrounds and experiences feel like home. What brings us together are 3 things: 
1. The curiosity for new perspectives to gain a truthful understanding of the universe and its inhabitants.
2. A passion for developing practices that achieve our personal goals and as such those of humanity at large.
3. Caring for empathetic relationships that support and inspire us on our journey.

If you’re excited to come, please consider sharing this announcement on social media or sending the link to a friend or like minded communities who might enjoy attending. Feedback from attendees along the lines of “consistently my favourite weekend of the entire year!!” is not uncommon so you could be doing somebody a big favour.

This event has a special place in our heart and we truly think there’s nothing else quite like it. It’s where so many of us made friends with whom we have more in common than each of us would’ve thought to be possible. It’s where new ideas have altered our opinions or even changed the course of life - in the best possible way.

Essential Information

When: Friday 29th August (12:00) - Monday 1st September 2025 (12:00)

Where: Youth Hostel Wannsee (Berlin)

Prices: The ticket includes accommodation, meals and plenty of snacks.

• Regular ticket: €250
• Supporter ticket: €300/400/500+

Nobody makes any money from this event and the organiser team is unpaid. If you want to attend but the ticket cost is the only thing holding you back apply anyway! With the help of our supporters we are able to provide some financial support for those in need.

Apply here: https://airtable.com/appkj2FkJDGMtM2MA/pagiUldderZqbuBaP/form

Contact: If you have ANY questions email us lwcw.europe@gmail.com or post them in the comments section below.

Get notified about updates: eMail Telegram

Schedule

Friday lunch: Meet in central Berlin at lunchtime for covid tests and vegan food followed by a quick bus journey to JH Wannsee (all included in the ticket price). You can also join us directly at the hostel if you prefer. The event officially starts on Friday at 16:00 with the opening ceremony.

Friday to Sunday: A packed schedule to choose from, early morning to late at night every day. The closing ceremony is on Sunday afternoon, followed by more activities late into the night.

Monday: Checkout on Monday is by 10:00 but you can store your luggage on site, join for lunch at the hostel and there will be people hanging around until early afternoon. 
S Nikolassee train station is an 8-minute walk from the venue. Long distance train stations or the airport are another 30-90 minutes away via public transport.

The days before and after the event: If you want to extend your visit and experience more of Berlin there will very likely be meetups arranged on the days before and after the event. Previously there has been: open invite rationality dojos, bouldering, visiting tourist attractions, night clubs and picnics in the park.

Food, Sleeping, Covid

Ample quantities of vegan food are provided 3 times per day in the JH Wannsee canteen.

An impressive collection of snacks are available as many times a day as you want at the legendary snack table.

Bedrooms look usually like this and there’s a process for matching up room mates based on sleep cycle, light/heavy sleepers and preferred gender.

We will observe the covid incidences during 2025 and decide whether it's worth testing everyone to prevent Covid infections. Following our testing process from previous years, we were able to keep infections and negative impact at a minimum. In order to attend you will need to take a rapid antigen test, that we provide, immediately on arrival. We will also provide tests which you are encouraged to use each morning before you leave your bedroom so to stop infection chains on the spot.

Application FAQ

I want to come but I’m worried about filling in the application form. Will I get rejected if I say the wrong things? How much should I go into detail?

We gently encourage you not to worry and to send in an application anyway. We are actively looking for amazing diverse participants outside the stereotypical schema.

Just tell us honestly why you’re excited about coming, who you are, how you feel about this whole rationality thing and what you might be excited to contribute. 
100-300 words total are perfectly enough.

We expect about 1.5x applications per spot so your chances are good!

Does the activity or workshop I run need to be very high quality?

You don’t need to run an activity at all, unless you want to. Many participants do, so there’s no necessity for every person to run something.

It’s true that we are looking for participants who are excited to contribute but there’s plenty of other ways to do that too: helping someone else research and prepare a workshop, being an on-site helper who refills the snack table, volunteering for the emotional support team, giving a 5 minute lightning talk or just being an awesome and friendly human being to hang out with.

And if you do organise an activity – make it something you’re really passionate and curious about, and put in as much effort as you think the topic deserves. Nobody is going to judge you harshly if it’s not perfect. In fact jumping in enthusiastically anyway is very much in the spirit of the event!

Can I bring my children?

Yes! Children up to 2 years old can come for free. The hostel can provide a crib and offers some family rooms. Up to 6 years old are half price. Let us know on the application form if you’re interested in childcare – and if there’s sufficient demand we will organise that for you.

We usually have a couple of older (8-14 year old) kids attend with their parent(s), but every year we want to be more inclusive of families so hope there will be more!

I don’t feel like part of the Rationality/LessWrong community. I’ve never been to an event or meetup like this before. Should I still apply?

Yes! LWCW is very newcomer friendly and you won’t be the only first-timer. In fact this is how many people meet great friends in the LW and EA communities.

What matters is that you feel a connection to our shared values: curiosity for new perspectives to gain a truthful understanding of the world and its inhabitants, passion for developing practices and systems that achieve our personal goals and, consequently, those of humanity at large as well as nurturing empathetic relationships that support and inspire us on our journey.

We aim to make this year's LWCW even more diverse and inclusive because we are convinced of the benefits for the whole community. If you feel you don’t fit the typical model of a LWCW attendee (whatever that is) in terms of age, gender, sexuality, race, economic or educational background – we really want to encourage you to apply!

There's no option to choose your ticket type in the application form, what happened? And no volunteering checkbox?

Yes, that's true. We've changed some things in the application process, for example we’re returning to processing applications as they arrive, and you should hear from us within 2 weeks of sending your application.

You'll only be asked to choose your ticket type after you've been accepted. This year we will only ask for volunteers in July, since people have a better idea of their capacities then, and the Ticket Type form has a checkbox to express interest in volunteering. A few of the volunteers will be asked to arrive on Thursday and spend an additional night at the hostel to be able to help already on Friday morning - if you are interested in this aspect and need to make travel plans early, write us an email.

Help Us Spread The Word

LWCW is volunteer organised with no marketing budget so we rely on word of mouth to get the message out.

If you’re able to, please consider sharing this page on social media or sending the link to a friend who might enjoy attending.

Feedback from attendees along the lines of “consistently my favourite weekend of the entire year!!” is not uncommon so you could be doing somebody a big favour.

We can’t wait to see you there!