Hooking up at concerts?

So I am going to lollapalooza and Northcoast (which is a chicago music fest)and other concerts and I've been to past concert. I have friends that tend to like to hook up with random guys at concerts. Would you hook up with a person at concert or its to gross?
Updates:
+1 y
Let me clarify hooking up I mean kissing ... Then probably having sex after..
Hooking up at concerts?
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