Unfortunately it's on short notice, but hopefully it will become an annual thing: Unigine OpenAir. This is perhaps the most interesting and unique game development conference I've yet to hear about: it's camping in tents outside the city of Tomsk for two days filled with gaming-related talks. There is no Internet connection at Unigine OpenAir, but to make up for it Unigine is hosting a whiskey party, barbecues and kebabs, the best DJ from Siberia using the best dj equipment, fires, and other special events.
OpenAir will cover the starting of game development, popular stealth secrets from Unigine, Unigine Engine related talks, deferred rendering, mobile platforms, demo scene, flexible cross-API technology, and the history of Unigine. Representatives from over a dozen companies, including Ubisoft, will be at the Unigine conference.
The English-translated version of the Unigine OpenAir web-site is available via Google.