Mixily - Hosting your event just got easier.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Diobox - All-in-one event and guest plafrom with a built-in CRM
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
SlickPix - Instantly create dynamic events from multiple cameras
Bigtent - BigTent is a web-based organization and communication portal for groups.