You have a few hours to play some RPGs in a workshop or a convention. You don't have the time to learn the system, and you don't have time to create a character, and worst of all, if you try a new game, you wouldn't even understand the numbers on your character sheet. I know, most people would say: you should play a 5th edition derivative, and that is the answer for everything™ and everything else too. At least if... I wouldn't list all the reasons why we have chosen Call of Cthulhu instead. But this problem led to an adventure idea.