Use Twtvite to organize Tweetups, manage a Tweetup group for recurring events, and sell tickets online.
You don't have to have a Twitter account to RSVP to an event on Twtvite.
Let users RSVP in different categories, for example: attendees, sponsors, etc.
Invite friends via email or Twitter or send updates / changes about an event.
Sell tickets directly from your event page. No per-ticket fees!
Let people find your Tweetup Group and keep in contact with your attendees.

The founder answers all support questions and emails personally. Here are some ways to get in touch with us: