I have an extra set of rims for my mountain bike, and I had some slicks mounted to them that I used to use before I got my road bike. There's a HUGE difference between knobbies and slicks on my mountain bike. My slicks are Specialized Fat Boys. (26 x 1.25) and I put 100 psi in them. They're good for things like paved bike trails. I got them because my LBS had them in stock and they fit my rims. I didn't concern myself with weight (they're on a mountain bike!!). And there are no concerns of tread choice. So I don’t know how you could go wrong.
How long is the ride? What kid of terrain? Will it be windy at all? At the Cinderella, I was surprised to see how many women rode mountain bikes or hybrids. And many of them had Knobbies or semi-slicks. That would be fine on a flat ride like the Cinderella. But if there is a lot of climbing, it would be pretty tough!
P.S. don’t use ultralight tubes .