Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Nicebreak - Virtual events for your team that they will love
Event Hunt - Startups and Tech Events Curated By Locals
Roomkey - Gamified social network for virtual events
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Selfiebot - The premium robot photo booth