Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Wedgies - Realtime polling over social media

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Poltio - Create and share questions, get answers.

Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.

SurveyMonkey Intelligence - Usage and download metrics for all mobile apps