The metal figures would heat up in the sun and then expand so cracking the paint job. The plastic ones would just melt whilst one of the players would probably accidentally turn the hose pipe on the terrain (whilst attempting to cool off as we don't have a pool)and all the paper mache terrain would turn to sludge
Even the Baron would end up with hot dice, but then they'd probably just burn his hands, the beer wouldn't be cool enough and the wine would be as if mulled and we'd all be miserable and smell of sweat and fights would break out because somebody's sweat would drip into their eyes and so they'd mis-measure a charge distance and be accused of cheating

Christmas game by heck - bah humbug
