You can come in as early as noon and enjoy tea service with fresh scones and real clotted cream, both prepared on the premises. Of course, you can come in for cocktails in the evening to check everything out. That will take a while, and be well worth your time. There are 9,000 tons of Italian marble in the place, from the same quarry as the stone used in Michelangelo's David. To your left is the discreet entrance for Paris, a bar and restaurant, and the far right wall holds a dining area to another restaurant, the Pantheon.
People come in after the theater or shows, for a late-night dessert.
People also like to see who's who, and who's wearing what. I've seen Chanel gowns in here. Not everyone may have couture clothes, but style is required at the Rotunda. Not a guest of the hotel, Starr just wanted a quiet drink, though she was checking people out.