Some schools are members of mandatory or voluntary networks. These can be associated with the same educational values, same patrons, or other commonalities.
How to engage school networks?
See if being part of the network requires you to follow certain curricula. Some school networks draw up their own curricula and apply them across all schools involved.
See what common ground exists between schools. Is it funding, common values, subject-specificity, or a non-traditional focus or method of teaching?