I'm not familiar with this model, so I don't know if the wings are sheeted foam or sheeted balsa, but...

If they're balsa, I'd poke small holes with a pin at the locations of the ribs, and dribble a little thin CA into them, to re-adhere them to the ribs. (If you have a little glue syringe, this is a good place to use it.) Use a piece of waxed paper or plastic wrap, wrapped around your finger, to hold it down while it cures, so it doesn't stick to your finger.

If they're foam, I'd make a rectangular cut through just the sheeting where the bubbles are, and remove it. Then I'd put a little epoxy on the foam, replace the sheeting, wipe off any excess epoxy, tape it down, and wait for it to cure.

After using either of these methods, you can fill and sand as needed, to get a good surface finish.

For me, the issue would be safety. I'd want to make sure that the sheeting is adhered to the underlying structure, so that it can properly spread the flight loads. You don't want your wing folding in flight.