Conventions/Meetups. Mod note: I hope it goes without saying that you shouldn't meet new people whom you only know via the internet without telling someone where you are going and meeting in a public place.
pooffs: Potter Organization Of Fan Ficcers- St Louis is a St Louis area HPFF meetup group! It's a place to meet other FanFiccers (readers, writers, betas), trade good stories, get writing tips, share HP news, and just have a blast with some really cool people! This is an adult group. You must be 18 or older to join. Sorry.
harry_potter: A general hub for HP fans to gather and discuss JK Rowling's Harry Potter series.