Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
1up Events - Corporate events as a service
Babble - A more personalized social network
Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.
Palaround - Meet people you should be friends with.
Facebook Local - Discover places to go and events happening near you