Try starting a group on one of the alt social media platforms i.e.Gab, Getr or even telegram. Find a list of contacts from the electoral details that should be publicly available. Maybe you can get a list from the school, although I doubt that they will provide it, citing privacy. If you are really motivated, start knocking on doors. I don't recommend standing at the school gates and petitioning, however, you are too easy a target there.