I kinda struggle to imagine american kiddies going off to dnb tbh. But you know your school environment more than anyone here. Try and fit in some stuff that everybody knows and you'll be off to a good start. You said trap, I don't know much of it, but Drake's last album was pretty traptastic, imo. Did heavy rounds at parties I was at last semester and people get pretty into it.
Like just have some tunes backed up for any moments where large portions of the audience look at you like "what the fuck is he playing at?"
As jrkhnds said, they don't actually care about the music you want to rep, but that can work to your benefit. Try to keep them on their toes, but challenge them too.
I'd go with some commodo, he sits on that borderline trappy vibe but still makes some heavyweight halfstep shit, from there you could even work to delve deeply into some classics, or go trappy and wherever the heart takes you from there, flip back and forth. From there you can start to test their open mindedness, with safety tunes ready to go if you need, for the opening 10-20 (depends on how quickly you mix) and then start to focus in on whatever it is you want to show them, but still keep the safeties backed up.
I've seen people take requests in advance on facebook before and just see what they can fit into their sets.
I definitely wouldn't open with dnb though. You really want to have them dancing before you try to "force" them to lol. Like, I would want to feel like the set had peaked before I started dropping dnb tunes tbh, the wrong crowd really will hate you for it lol