I think it is too late to demand a renegotiation of terms this year. Even if they didn't do as much work as you, they've gone into this thinking they were getting 50%. After this year's event is over, set up a committee made of an equal number of members from each chapter to have open discussion. If you've never asked them to do more work, they might not be aware of how much you all are putting into the project. If you can't come to an agreement on amount of work from each chapter and a splitting of profits, don't do the event as a joint event anymore.
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