I didn't know anybody still made canvas tents!

I was warned to NEVER EVER EVER put one up damp, because it will mildew and next time you go camping you'll open it and find holes. So if it's damp or raining when you have to pack up to go home, when you get home pitch the tent in the yard and leave it out until it's perfectly dry, then fold and store.

I don't recall ever having to do that, but I had a friend who didn't!