There is normally a lot of fine print on concert tickets and the like that effectively make it a contract. Probably no such luck with prom tickets. I have a feeling the school district will be paying to get the nuisance suit to go away.
Especially since Guam adopted the entire criminal and civil codes of California, except for changes made by the Guam legislature.
Older Guamanians are really conservative but many of the younger ones only respect the big government nanny state.