Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
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.