What is the most logical next event?

How to ask a cute stranger out
Smile.
Smiling at a person shows that you are friendly, non-threatening, and interested in them. If the person smiles back at you, it is a good indication that they are thinking positively of you.
Notice the difference between a " real " and a " fake " smile by noticing if the skin at the outer corners of their eyes creases when they smile. These creases indicate that the person is genuinely happy.