Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Rutter - One API for every Ecommerce platform
TechEvents.co - Tech and startup events aggregator
Event Finda - Find events near you, and all around the world.
Facebook Local - Discover places to go and events happening near you
Find Near Me - The easiest way to find everything around you (Apple Watch)