Best way to keep macaroni and cheese warm for a party?

I’m having a party tomorrow and expecting somewhere around 20–25 people. It isn’t a dinner party, but I anticipate more of a “buffet” type set up for the food.
We are having pulled pork sandwiches, which I am just going to leave in a crock pot for people to serve themselves. I know that I have some guests that are vegetarians (but not vegan), and I wanted to have a non-meat dish that is hearty but goes well with the pork as a side dish, as well. I was thinking macaroni and cheese -because I have a lot of other preparation to do, and I don’t want to spend all day cooking.

I also want to avoid using my oven/stove very much, since we don’t have central air, and I don’t want it to get hot in here. Normally we just grill when we have gatherings like this, but we’re expecting rain. We always do chips or pitas, plus a veggie tray, as well as a relish plate with olives and pickles and whatnot.

So what is the best way to keep mac n cheese warm for a buffet? Can I toss that in a crock pot after it is cooked just to keep it warm?
Maybe you have better/easier/more suiting ideas than mac n cheese?