He doesn't know almost anything about feasts, except that they're important, and he doesn't know what he will need to act like. ...And he knows people wear nice clothing, to feasts, and he doesn't have any (which is good, it is sinful to seek material finery...)

He's already in his best clothes, for coming here, though if they're given time he can put on fresh clothes.

She researched what she could on feasts in Auradon and summarized it for Greta, though neither of them really have clothing nicer than what they're wearing either.

This sounds like an opportunity to see many of those in the school at once; good.