This is taken from Eurogamer.net:
Microsoft has announced Xtival 07, a European-only online event taking place next month.
From November 23 to 26, Gold memberships will be free to everyone with a broadband connection who connects to Xbox Live and signs in.
Microsoft promises a line-up of events, competitions, and exclusive downloads to be announced soon on Xbox.com. The company is also promising “headline acts” for existing Xbox Live Gold members.
The event is only taking place in European countries with Xbox Live service.