When the Aliens showed up, the Caf just started serving more food rather then changing their menu. Afterall, it wasn't meant for human consumption in the first place. Students always are trying to sneak out and get something at the local fast good joints. Check the TFOS Mux Web Page for School Dates and times. PCs outside of the school at that time are subject to having Parents, Police, ACO, or worse, the Truant Officers come after them.
Some teachers are nice, some are bumbling, some are destructive.
Make up a couple teacher names and stick with them, possibly passing them onto other PCs to keep some consistancy. Faculty may or may not be able to help you. If they can't, don't try sneaking out. That wouldn't be a lot of fun since you wouldn't be able to dodge the Hall Monitors and such. This should be a pretty easy one for you.