Pogoseat - Pioneers of the in-event seat upgrade technology and Text-to-Buy mobile ticketing soltutions.
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.
Palaround - Meet people you should be friends with.
Guestlist - Market events online, accepting registrations & ticket sales
Babble - A more personalized social network