3D Hubs - Airbnb for 3D printing
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Muglaunch.com - Design and sell print on demand products easily @ Muglaunch
Event Hunt - Startups and Tech Events Curated By Locals
Zazzy - Design and sell your own 3D printed jewelry
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets