Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Find your best festival - Compare the music you follow with 100s of festival lineups
Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.
Everfest - A global calendar and search engine for festivals
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Hootenanny - Find music festivals featuring artists you love.