Make Ahead Quesadillas
Yes, that sounds like a great way to do it!

Prepare all of the components ahead of time, assemble the quesadillas, and stash them in the refrigerator.

When you return home with your guests, all you need to do it warm and serve.

The only real consideration is the moisture content of your veggies. You may not want to include them inside the tortilla during the fridge testing period of they are in danger of making the tortilla soggy. It probably won't be an issue, but it's something to consider. You can always cook up the veg and keep them in the fridge separately from the quesadillas until you are ready to heat.