Zenly - Zenly is a GPS tracker to locate your friends in realtime.
EventsApp - A simple concise app for creating and sharing events.
ToT: ThisOrThat - Let your friends choose this or that for you
Event Hunt - Startups and Tech Events Curated By Locals
sup - The first creep-free way to see nearby friends
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.