There's going to be a LessWrong meetup at the 35th Chaos Communication Congress.
This is an annual (with increasing numbers) event organised from the Chaos Communication Club. This year it's going to be roughly 17k enthusiasts about computer science, technology and other related subjects. More information can be found here: https://events.ccc.de/congress/2018/wiki/index.php/Main_Page
Look up the actual meetup location in the self-organised-session part of the wiki: https://events.ccc.de/congress/2018/wiki/index.php/Session:LessWrong_meetup
(updates will follow)