Pool Noodles - Place them like this in your canopy so they add tension to the roof. This will prevent rain water from collecting near the edge and weighing down the roof.
I always place the entrance to my tent under a canopy. This allows me to to stay dry when entering the tent. It also protects me from the sun. And I can put a rug down in front of my tent to wipe my feet.
If you are using multiple canopies, considering some canopy gutters. They are basically 1 foot by 10 feet strips of tent material that you attach between two canopies. This way you don't have to avoid the drip-strip under two canopies.
Outdoor rugs can help to prevent the ground from becoming a muddy mess. They sell large, lightweight plastic rugs that work very well for this. They can be folded down to a portable size and are very light. They allow water to pass through, so they don't soak it up and become heavy.
I've learned to not put a tarp under my tent, that just traps water between the tent and the tarp. Put a tarp down inside your tent and then put a rug (or towels) on top of that. Nice dry comfy rug in your tent.
Apparently it rains every time I go camping...
Not sure if needed, but heating it while bending may be beneficial as well