DownToDash - Meet fun people based on activities & discover events!

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.

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Upcoming.org - A simple way to share and discover interesting events

Morse - Create, shout out, and discover nearby events in real time

Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.