Grab a Catt that is spilling out of the pot, and is ready for division. Pull
it out of the pot and look for the natural divide (there will be one).
Either cut or pull it apart, treat the wound with some cinnamon, trim the
roots and pot it up. Also, encourage them to bring plants that they think
need repotting. They will gain more knowledge working on their own plants
than yours.

I've done this with our society a number of times. The members love it. If
you have enough people, consider breaking into work groups with a leader for
each one. Five or six people to a group is ideal; no one can hide, LOL!

HTH

Diana