Having discussed this topic with friends on Facebook, my friend Diane Froehlich Heidt suggested a tip that I felt I just HAD to pass on to my garden blog readers.
Diane states (to carve a pumpkin early in the Halloween season and NOT have that nasty rotten pumpkin issue before Samhain) you merely slather the carved pumpkin with Vaseline. (Reportedly it seals the pumpkin and works like some sort of air seal.)
HAPPY SPOOKY SEASON!