Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

keezy - A colorful soundboard. Play with music.

Event Hunt - Startups and Tech Events Curated By Locals

Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Splice - Music creation, collaboration, and sharing made simple.