I'm going to FOSDEM'24. Assuming to meet Debian and Kernel folks there, this should be a good opportunity to do PGP keysigning.
If you also go there and you're interested in keysigning: Send me your key via email to email@example.com. I'll collect the keys, create a paper list for a keysigning party and send it back to you in the week before FOSDEM. The list will only be made available to other participants.
Then maybe wear a "keysigning" badge (or a crepe tape with that caption) that allows us to identify others on the list. If there are not too many who are interested, I guess that should work fine. (If this idea becomes too successful, I'd close the list after the first 100 participants.)
Update: Several people let me know there is another keysigning announced on Ludovic Hirlimann's blog. So you might want to bring some more paper slips with your fingerprint and show up there, too.