Character Analysis
When Ben goes to the Taft Hotel to meet Mrs. Robinson and commence their affair, he pretends that he's actually there for an event called "The Singleman Party," being hosted by a lady named Mrs. Singleman (Alice Ghostley).
It's a big family get-together, standing in striking contrast to the adulterous affair that is about to commence. To avoid confusing the room clerk, Ben acts like he's there for her party, but then ducks out and admits to Mrs. Singleman that he's not really a guest after she starts introducing him to people and trying to figure out who he is.