Should I return the favour?

I have stayed with family friends for like 7 years now after i moved out of dad's house who was divorced long back. The family friends, a couple financially helped me a lot apart from other things and never took anything in return till recently they asked me to join a party they have which is private and official and of the adult nature (nope not sex and all just that its very intimate ) they have never asked me before and even asked me to wear a dress they selected.

Should i return the favour... I dont know how it will turn out as many are elite people !
Should I return the favour?
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