What a nice thread! Glad it didn't get buried somewhere else.
I'm a grandparent and just went out to get the newspaper. It was cold and damp. I'd freeze to death in this crappy weather, not to mention, how heart-attack-disgusted I'd get if we play the way we have so far this year.
I guess the answer depends on what kind of health your grandfather is in and whether or not he has the correct gear to wear to the game.
Taking him to a sports' bar/hotel might be the safest thing to do but it's hard to say no to actually being in the stadium. What's his opinion or would he just say, "Let's go