The Rolling Stones are coming to Letiště Letňany in Prague on July 4 for what will be the largest concert of the summer and likely the largest the city has seen since the Stones played outdoors in 2003. Well over 50,000 people are expected to attend. The organizers announced the opening acts plus some very important rules that concertgoers will need to know ahead of time, in particular strict size restrictions on bags and travel info.