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Saint Vitus is the patron saint of actors, comedians, dancers, and of entertainers in general.
Learn More:Saint Vitus
I don't believe there is a "should" attached to an action/expectation such as this.
A kiss on the forehead or the cheek, would be nice or perhaps a hug. I think it depends on how well the date went & what the "chemistry" feels like. But it has to come naturally.