Premise: "Girls in purple asian dresses sitting in chairs in a formal setting."\nHypothesis: "A girl is at a party."\nDo we know that the hypothesis entailed by the premise?
Let's be accurate as possible and think first.
it is not possible to tell
Just because girls in purple Asian dresses sitting in chairs in a formal setting does not indicate that they are at a party.

.

So, the final answer is it is not possible to tell