Here are a few numbers...
Americans spend $6 billion dollars, as of 2009, on museums, $14.5 billion on performing arts events, $10.5 billion on movie theaters and $20 billion on sports venues.
One-half million attend Museums on an average day. On holidays, 885,000. 1.5 million for the performing arts, 3.4 million see movies, and 2.7 million sports.
Museum attendees spend an average of 2 hrs and 24 minutes on a visit. They enter mostly between noon and one PM. For performance arts and sports, this happens between seven and nine PM.
Museums need to be open during night-time hours.