PartyWith - Connecting people who love to party - anytime, anywhere.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
The Simple Postcard - Text a photo to mail it as a postcard
Event Hunt - Startups and Tech Events Curated By Locals
LinkedIn Events - A new way of connecting people from LinkedIn
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets