crush room

noun1

1. •
   (old-fashioned) A large room in a theater, opera house, or other public building, where the public may stand during the intermissions; a foyer or lobby.

   • August 2, 1833, Thomas Babington Macaulay, letter to Hannah M. Macaulay Politics leave very little time for the bow window at White's in the day, or for the crush-room of the opera at night.