Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Red Tricycle - Find Great Family Activities
Event Hunt - Startups and Tech Events Curated By Locals
ScribeHow - Create step-by-step user guides, with a simple click
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Foodie Advice - Get suggestions on what to eat during your travels