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.
Upcoming.org - A simple way to share and discover interesting events
Vamos - Local Event Discovery
DownToDash - Meet fun people based on activities & discover events!
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Party With Me - Find parties nearby