TechEvents.co - Tech and startup events aggregator
Overnight - Book a last minute room with locals, in seconds.
Facebook Local - Discover places to go and events happening near you
FriendsTonight - Meet new friends to join your friends, tonight
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.