Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Foursquare - Foursquare is all about helping you find new ways to explore your city.
Event Hunt - Startups and Tech Events Curated By Locals
Mapple.me - Mapple.me bridges the gap between available time and availability of friends to increase social...
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets