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

SmartDVB - This is a fully functional DVB application which supports DVB-S/T/C and ATSC devices.

Facebook Local - Discover places to go and events happening near you

Tvheadend - Redmine

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

DVB Dream - DVB Dream is DVB player with many nice and unique features (more below), it supports standards...