Alkarta - Find happenings in your city.
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Project Fixup - Meet people, not profiles
Mutronome for iOS - Practice drums with Apple Music
Palaround - Meet people you should be friends with.