Hmmm... Since it is a long trip, my preference is to run the Petawawa Town section on Friday afternoon, then drive up to Laniel afterwards. I haven't decided which boat to bring, but I can certainly use my car and bring one other person with me.
I don't think it is a good idea to leave Saturday morning, as the shortest route is approx. 420 km and would take around 6 hours to cover. And if you look at the map, Petawawa is almost exactly halfway! So the only option, if you want to do 2 runs, is to leave Friday.
The festival t-shirts have to be picked up in Ottawa, I'm waiting to hear more about this before organising anything.