Was at a bar some time ago, I was with some guys and I was kinda just enjoying the music and having a good time. Saw this girl looking at me, making eye contact while she continued to sing. I didn’t think of it too much as She was in a group of girls so I didn’t want to solo it.

But my question is 1) how do you know when eye contact from a girl is a sign she’s interested? 2) when you do catch a girl looking at you, what do you say or do? Do you smile? Wave?