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
Event Hunt - Startups and Tech Events Curated By Locals
Klook - Discover & book amazing experiences at exclusive prices
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Airbnb - Book unique places to stay and things to do.