Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
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
Bylde - Bylde is a SaaS platform you can use to Start, Manage and Grow your groups and communities.
Viator - Tours, things to do, sightseeing tours, day trips and more from Viator.