Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
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.
PartyUP - See videos from the best nightlife venues in your city.
Morse - Create, shout out, and discover nearby events in real time
WOOdate - Find, customize, and plan your entire date in one place.
Upcoming.org - A simple way to share and discover interesting events