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.
Emamo - Simple event tools for organizations. One central hub to manage your events and members — all year long.
DownToMeet - DownToMeet is a platform to organize, find, and attend group events.
Bark - Be a part of your dogs social life
Collaborizm - Meet New People. Build Amazing Things. A workspace for aspiring Entrepreneurs, Engineers, and Creatives.
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform