TechEvents.co - Tech and startup events aggregator
Foodetective - Simple food discovery from restaurants to bakeries
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Facebook Local - Discover places to go and events happening near you
Endorse - Share your favorite recommendations with friends
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.