It's all about contact- eyes and physical. After that it's either about dance seduction or venue change.
I usually will make eye contact. Many times I will fake a bump into a girl, or pull her hair as she walks by, although it's pretty risky. A less risky physical contact is a hand on the back (you gotta know where) or along the arm, or brisking by with some hand to hand. Keep her in your peripheral view because, I do this shit all the time, so it's me just casually doing me, (fake the casual side until it becomes you) and then when I see she's looked I shoot for eye contact.
Because I am walking by I can't go back to her, I am on my way somewhere. So I will pause for a second and reach for a hand and pull her towards me to the dance floor, then squeeze her hand on the way there so she can have a chance to squeeze back.
Then I let the dance seduction begin. And that...is another post
