One of my cats has a good couple of sneezes every few hours - nothing too violent, still eating, etc.
She's been doing it for a little while, and when I had to take her to the vets for her boosters, I did mention this, but the vet said she was fine - been going on for a few weeks now - can they get the common cold?
we had a cat several years ago that used to do this vets said he was fine but 2 or 3 times a day he would have a sneezing fit and the snot would fly never found it made any difference to him and he did it all his life
i had the same kind of problem with my cat, took her to the vets she was given antibiotics and treated for lung worm..... however a few days later she sneezed and a blade of grass came out of her nose, could your cat maybe have had the same. hope this might be of some use to you gouldc