One of my favorite conventions, WonderCon, will move to Anaheim for its 2012 show. It's traditionally held in San Francisco at the Moscone Center but that venue is undergoing major renovations and dates were not available. So instead, WonderCon will take place in Anaheim and the dates are March 16-18, 2012. So things don't get crowded there, Wizard World will postpone its April 2012 show and ReedPop's C2E2, which had been planning a March show in Chicago, will have it some other time.
I'm sorry to hear WonderCon couldn't get space in San Francisco as that location (the city and where they are in that city) has a lot to do with the wonderfulness of WonderCon. But it ain't everything. There's plenty that will be wonderful at WonderCon in Anaheim. More details to come.