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(AP) -- The St. Louis Cardinals' clubhouse will be the only area off-limits to U2 at Sunday's Busch Stadium concert.

Organizers anticipate a crowd of 52,000, a record for the 6-year-old stadium in downtown St. Louis. Crews began tearing out sod only hours after the Cardinals beat the Arizona Diamondbacks last Sunday, clearing the way for a massive revolving stage that features claw-like legs and a huge monitor behind the band.

The home and visitor's dugouts will serve as first-aid stations.

The visitor's clubhouse will be the dressing room for U2.

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