Dueling Press Previews

Is there some new antitrust ruling I’m unaware of, which says that museums in the same city can’t collude with each other in scheduling exhibition press previews? Yesterday, I had to miss the American Museum of Natural History’s new Hall of Human Origins because I felt it was more important for CultureGrrl (but not for Lee Rosenbaum, who grew up loving AMNH) to see Reverón at the Museum of Modern Art. (Yes, I technically could have scurried to both, but I’m not that nimble.)
On Feb. 20, there are dueling press previews for Jeff Wall at MoMA and Gordon Matta-Clark at the Whitney.
This never used to happen, but it’s occurring more and more lately. I know that museums are competitive, but this is ridiculous. Coordination, please.