I have never seen this.
Some dances have a fiddle case open collecting admissions, and sometimes as informal as
"$X dollars in cash or barter". Some dances are "bought out" by
sponsors, and an optional donation is solicited to help defray expenses.
I have seen optional collections for the "Floor refinishing fund" or whatever.
But (happily) I have never, ever, seen a collection for tips.
Dan
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