Suburban DC School's being Flyer'd by Ex-Gay Group
I understand that every non-profit has the right to distribute flyers in this situation. I hope there are also plenty of flyers from PFLAG and Truth Wins Out.

Whether or not religious organizations and/or content is allowable sounds... well, complicated. But if it's not, then PFOX, the author of the ex-gay flyers has some explaining to do. They have an entire page devoted to religious essays and resources.