Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Audio Hero - Over 250,000 royalty free music & sound effects for videos
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
TunePocket - Download 11,000+ royalty free music tracks and sound FX. Buy once, use forever. New music added daily. Save over 50% compared to most popular similar services. Incredible value!
Bigtent - BigTent is a web-based organization and communication portal for groups.
Premiumbeat - Premiumbeat.com provides high quality Royalty Free Music.