Probably a multi week course (not constant), or something that teaches you a skill and gives you the chance to implement social changes. For example, 8 weeks of weekly meetings and 1-2 weekly video lectures, along with a week to practice your new skills.
I've had an interest in setting up a course like this for a while now. I'm actually putting together a short survey right now to gather feedback and gauge interest. If I can find enough people and the format is right, I would make it happen.
Are you thinking of doing something like this?