Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
Metastream - Watch streaming media with friends
EventMobi - EventMobi is an interactive mobile event app, audience response and engagement platform for conferences and trade shows.
StreamParty - StreamParty is a watch communiry, that allows you to watch video streams in sync with the people you care about, on multiple services.