For one night? There is no way I would say no.
I interpreted the drinking question as a subtle reminder to people without teen-agers that it would be frowned upon.
I am not surprised a 17 year old male would prefer to sleep in an alley than compose a polite request that he and his friends visit with his aunt. (The composing, not the aunt, being the stumbling block. Either he can’t do better than “yo, can we crash?”, OR he’s a well-brought-up person who dislikes asking for favors. Or both.)
I would send a list of house conditions & rules to the intermediary; you can’t really do that to house guests, but you also can’t really trust teen-agers en masse to assume the rules of civilized behavior.
I would not go out of my way to entertain them; they are not coming to visit you, they are visiting while they happen to be in town.
I would have them all bunk down in the basement. If there a bathroom down there, you’re all set. I would ask if they plan to have dinner and/or breakfast with us; I would feed them hamburgers and/or pancakes.
I also think that he has been told the only way in hell he can go to this meet with those hell-raiser friends is if he stays at your house.

