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.
GetYourGuide - Get tickets to the most popular attractions while travelling
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Airbnb Experiences - Airbnb expands beyond rentals — now hosting Experiences
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Viator - Tours, things to do, sightseeing tours, day trips and more from Viator.