Sly Flourish has partnered with Let's Quest, a 501(c)(3) non-profit supporting school & library TTRPG programs, to offer resources for after-school RPG programs. Contact Let's Quest if you're interested in accessing their resources or donating to their program!
Here's a list of other free resources that may help you run your after-school RPG program:
Let's help the next generation keep rolling 20s!