Yes, that would have been one of the Marvel panels of that era, presided over by Mark Gruenwald.

At the time, Mark found most convention panels to be pretty boring affairs, and all the same–show a few slides of upcoming books, open up the floor to Q & A, rinse and repeat. And none of it really had any great effect on selling comics.

So instead, Mark decided to turn Marvel’s panels into performance art, into living game shows in which fans from the crowd would compete against Marvel creators and editors for prizes. The photos you’re talking about would seem to be of two of the many games that Mark devised.