Google is sponsoring HTML5 hackthons in four US locations throughout August, 2011. Teams will build app and compete for prizes.
Google will host an HTML5 game development competition at PAX Dev, the developer-focused pre-conference conference prior to PAX.
New Game is a new conference devoted entirely to HTML5 game development. Nov 1-2, 2011 in San Francisco, soliciting speakers until Aug 1.
Mozilla is hosting an HTML5 hackathon at Mountain View’s Computer History Museum from July 21st thru 22nd.