Hmm, ok, Bayhac had an RSVP system where people signed up on an online spreadsheet (brand G, maybe we can use the gitit wiki instead) and then the organizers printed name badges for everyone based on the signups. Bayhac really completely filled up though. I have no idea how many to expect for the emacs conf.
I wonder if there's a way to mark specific gitit pages as being editable without an account. Maybe I'll try to hack that in. If it's not linked from the main page and we just post the url in a few strategic places, spammers might not find it.
Or if we want to keep the signup info private, I could throw a simple web script together that collects the info and saves it, and maybe emails a link that the person clicks to confirm.