Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Sygic Travel Maps - Itinerary planner for independent travelers
Event Hunt - Startups and Tech Events Curated By Locals
Tripsy - Planning your trip has gotten much easier.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
TRAVO - Instantly create end-to-end trips around your events.