Pittsburgh just announced that there is going to be a Rock and Roll haf marathon in the city the weekend of August 4, 2013. The race could attract 8,000 people, and hotel rooms will likely sell out. If there are any August 2013 brides out there, it might be a good idea to contact hotels for room blocks now.
EDITED: Whoops, I just edited my post to say August 4, 2013. Hope I didn't alarm any August 2012 brides!