Loki headed for the hotel's grand ballroom. As he did, he mentally commanded the prom's chaperones to suddenly leave to get dinner at the hotel steakhouse -- he also altered the restaurant's reservation list accordingly. It worked, of course; by the time he got close enough to the ballroom to hear the thumping beats of the music that was playing, he passed a group of fairly nicely dressed men and women, most about his apparent age, walking in the other direction. He nodded at them. Another woman was rushing to catch up -- "Wait, forgot where I left my purse!" she called after the others.
The Norse god slipped into the large, dimly lit room. The awkward teenagers in formal dress, gyrating to the sounds being presented by a DJ in one corner, paid little attention as he moved among them. He smiled as he observed the action carefully -- the high school students, no doubt, assumed he was another chaperone, trying to make sure there was no "dirty dancing" or "hanky panky" going on. But he was focusing on faces and bodies, making mental notes for transformations.
He made his way through the crowd on the dance floor and up onto the small stage that had been erected on one side of the room. A wireless microphone appeared in one hand. He pointed at the DJ, who faded down the music. The lights in the room brightened a bit, just enough for Loki to be able to see the students, who were now looking up at him, a bit expectantly.
"Ladies and gentlemen," he said into the mike, "I am not actually one of your chaperones. In fact, I've sent them all away."
The teenagers looked around, a little bit bewildered, until finally, a cheer rose up once they realized they didn't see any familiar adult faces in the room.
Loki held up a hand, and the noise eventually died down. He continued, "Now, let me make sure everyone who's attending this prom is here. I'm sure they'd hate to miss this."
A door at one end of the ballroom opened, and in fell a group of Goth students, in their dark, unconventional versions of prom attire -- they'd been on the hotel loading dock, smoking behind a dumpster, until Loki's magic had teleported them into the entranceway.
"Welcome back," was Loki's response. The Goths got up and stood on the periphery of the clot of people on the dance floor.
Loki indicated the giant letters on the wall behind him. "So your prom theme is 'Time of Your Life,' I see. That may be more true than you think -- your lives are going to change here tonight. My name is Loki, and let's get started with..."