It's actually UnGnomeCamp:

Can't get in to the sold-out Gnomedex? Can't spare $500-plus price of a Gnomedex ticket (may be higher on the scalpers' black market, your mileage may vary) Want more than a single-track format, with speakers at the front of the room? Want more interaction, a chance to present, multiple choices? Want to continue the conversations from Gnomedex and delve into more detail? UnGnomeCamp is a chance to do all that, and more. It's an unconference using Open Space format.

They are... "using the BarCamp model to create an ad-hoc gathering born from the desire for people to share and learn in an open environment. It is an intense event with discussions, demos, and interaction from attendees. What it is in detail is up to you... participation is key."