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LiveMatrix, a search engine for events on the Web, has opened today to make sure people don’t miss shows and sales happening online.

The site’s definition of live events is pretty broad. It covers livestreamed videos from conferences, private sales or auctions with deadlines on sites like Gilt Groupe or even events in virtual worlds. At launch, it’s indexing 80,000 live events a week. This is distinct from more general real-time search, which looks for content that people are sharing or commenting on right now, and from models like the online TV guide Clicker, which looks for video content.

There are social features in the site, which let you RSVP to events or share them with friends. RSVPing is integrated into a Digg-like system, which shows you which events are popular. Naturally, you can set reminders.

The pair behind the the site, Nova Spivack and Sanjay Reddy, are experienced hands. Spivack cofounded EarthWeb, Lucid Ventures and Radar Networks, which made Twine, which was eventually acquired by semantic search engine Evri. Reddy was a senior vice president at Gemstar-TV Guide, whose parent was bought by Macrovision in 2008. They raised roughly $250,000 in angel funding.

The company is indexing the Web for events now, but it has also built easy ways for publishers to feed in their schedule.

The plan is to build an advertising network around the site. Content comes out in a number of ways; there’s the site, an application programming interface for developers to build on and the company is also building widgets to promote events.

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