I wouldn't say that looking good is reason enough.

[ she'd be much more comfortable in, for example, pants.

but she lets peter dictate where they wander, trying to look as casual as possible. fortunately, they aren't approached (probably because gamora doesn't exactly radiate "yes, please come have a conversation with me"), and it makes it easier to move around the area, to step just a little farther outside the gaggle of minglers. ]

That would be much easier for them to accomplish, yes. I'm sure they would find it preferable to set it and leave, observe from afar.

[ which is why having the other guardians making the rounds outside the building and the general bustle of the party is more ideal. ]

Somewhere more centralized would maximize the damage.