One good way of working that out is to orginise the events togeather, and if you are in two diferent towns, you can both run the fundraisers in your own town. This works well becouse most of the hassle is trying to figue out what to do and how to set it up, if that part is collaberated on then the actuall running isn't that hard, it takes some of the pressure off of both sides, lets the teams work togeather and there aren't any hard feelings or squables about who had more students there, or did more work, or anything else because the teams are seperate when the acctual money is being made.
