You may know Highlands Tap Room as the home of Metal Mondays, amongst their many other musical offerings, but this Saturday, it’ll be the home of a prom that will (possibly) be better than the one you had in high school — for one thing, there’ll be booze. All levels of fanciness welcome, but keep in mind that the candidates for Prom King and Prom Queen will be judged (in part) based on their style.