Your sister will give you a slut outfit to wear and a makeup make over that you have to wear for that event. It should not have given you that quest yet if you have not done these 2 parts for you sister.Hello, what do I need to do?
Head to the Red Light District at night, make sure you're wearing your sister's makeover outfit...
I've put on my makeup, stilettos, and the only dress I have, and if I go to the red light district, it doesn't give me any options. And if I take off my makeup, the indicator appears that I need to wear makeup.
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I have also tried wearing men's clothing and with normal sneakers and stilettos and nothing.
Just ignore that quest until you progress further with your sister.