Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Taab - Travel as a benefit™
Facebook Local - Discover places to go and events happening near you
TRAVO - Instantly create end-to-end trips around your events.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Sygic Travel Maps - Itinerary planner for independent travelers