Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Q-Stats - Get free marketing insights for every question on Quora.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Site Rank Data - View historical rank information of websites via time series charts.
Facebook Local - Discover places to go and events happening near you
HypeStat - HypeStat is free statistics and analytics service, where you can find information about every website.