A group of high school students’ carnival gone awry when aliens and zombies invade their town.

I revised it.

Party on! 😉
I simplified the baddies into one – easier for me to consume. Also, I envisioned an abduction scenario, and since most occur at night here you go:
“A group of band geeks must survive the night when z-aliens begin to abduct their graduation house party guests”

Take care.