Originally Posted by Gabez
Never heard of it -- but could it be referring to the Young Indy TV series? I think he went to the World Fair in that.
No, I don't think there was ever an episode where he went to a World's Fair - or at least one that was filmed, as there were dozens of episode treatments that never got produced (including one which introduced the MacGuffin of a crystal skull).
As for the game... I've never heard of it, but it's fascinating. Maybe it has something to do with the tagline at the end of FoA? ("Look for Indy's RETURN in an all new adventure... ...perhaps as a much younger man...")