Lechora there should be a problem of dina demalchusa dina and you shouldn’t be allowed to give alcohol to minors
however according to american law alcohol is permitted in case of religion so there should be no problem with giving alcohol to minors
espesially minors who are above the yideshe adult age of thirteen
and especially if the drinking is being controled by a rebbi or parent
for example my son goes to his rebbis hous year after year and he gets plastered each year but i know that he is being looked after by other bachurim and his rabbeim. And kenain ehara no harm has yet befallen him
acording to my experiens only dagerous things happen when there is no one watching the minor