[ He's quiet for a moment, while he debates what to say. "I'm having a really crappy several nights" is too much and "I just wanted to check up on you" is too something else... so he decides on a roundabout question, instead. ]
You weren't at the thing on Saturday, were you?
[ He assumes he doesn't have to specify which thing. ]
no subject
You weren't at the thing on Saturday, were you?
[ He assumes he doesn't have to specify which thing. ]