What are some alternatives?
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
Collaborizm - Meet New People. Build Amazing Things. A workspace for aspiring Entrepreneurs, Engineers, and Creatives.
Ticket Tailor - Ticket Tailor is an easy to use event ticketing platform that puts you in control.
FriendsTonight - Meet new friends to join your friends, tonight
Picatic - Picatic encourages event organizers to create a custom website, sell tickets and then determined their cost of use. Selling out events is easy with Picatic.