We need to start having rallies at every high school and even middle school/junior high across the country.
When I was in high school, I made this huge banner that said "Curfews? America?" and hung it up in the lunch room, along with a pocket for pamphlets. It took the janitors a while to figure out it wasn't an approved thing and take it down. So, stuff like that. You can also post dozens of signs all over the school.
Also, running for a student office is a great way to get the message out. Sure, maybe the class president doesn't have any *actual* power, but the school has to pretend it's significant for propaganda reasons (the whole point is to prepare students to be good little citizens and to love the sacred electoral process), so you can use that against them! Run a full-fledged campaign with a pro-freedom platform and everything! Come up with a few libertarian-type issues related to the school (merit-based pay system for teachers, more flexible class schedules, allow students to go off-campus during lunches and study halls, eliminate ridiculous police-state machinations from the school, reduce the school budget by cutting administration, etc.). If you ask, they may give you time on the loudspeaker during the morning announcements to make campaign spiels. You should of course blanket the school with posters and buttons and bumper stickers and whatnot.
I actually did this, and it was great fun, and I actually won the first round overwhelmingly, then supposedly lost in the run-off by a few votes (I think the principal probably committed vote fraud; the man did hate me and I'd been suspended several times, after all). If you actually win, endless opportunities for fun open up, because now you can pretend you're essentially part of the school board, or have some sort of authority to have say over how the school is run anyway, and the newspapers and local TV stations like likely run your press releases and events and interview you. Attend school board meetings. Budget time, prepare a detailed budget 50% of the current one. Stage protests. And on and on. I still wish I would have won; I would have had a blast fighting the system.