VRChat - Create and play in virtual worlds with others
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Spatial - Collaborate from anywhere in AR
Event Hunt - Startups and Tech Events Curated By Locals
Second Life - Second Life is a virtual reality platform where individuals interact in a virtual world. The software was developed in 2003 by Linden Labs. More than one million people now regularly use the software.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets