Does it need to be prepped totally in advance or can you reheat on arrival and/or do minor cooking? I ask because we had this for a while and still sort of do at times and I have a few options. And my top tip is get an air fryer for quick cooking, and leverage the microwave for reheating.
So yes to pasta which can just be microwaved as needed or slow cooker dishes. The MN paranoia about rice always bemuses me. If you cook rice and leave it on the stove for an hour or two then just microwave the rice with whatever you've got going on in the slow cooker, it's fine.
We don't like to eat too much pasta type dishes so we also have other options.
eg
Last night I made mince tacos. I cooked the mince and preppped all the toppings/sides earlier. Then as people appeared for food, I just quickly heated up the tacos and made up the tacos. DH/DS can do this for themselves too. Fajitas work similarly here. If doing Halloumi, we make that at the same time as heating up the wrap but chicken/chorizo can just be done in advance. This is somethign I often do for hordes of teenagers who have been playing sport or at the gym or a day out and DS' and his friends turn up anytime between 7-9pm as hungry as starving wolves!
Fish cakes was a popular one here for a while - I'd make a salad or some veggies and perhaps some mashed potato, then everyone would just stick their fishcake in the airfryer for 12 minutes or so as they came through the door. Works as well with crumbed fish fillets/fish fingers or crumbed chicken pieces.
Similarly, i sometimes did salmon pouches in tinfoil and again, those would be shoved in the airfryer as people came through the door.
We love baked chicken pieces and I find them great for days like this. Served with salad or lightly steamed veg and new potatoes. I make up the plates and everyone just microwaves them as they come through the door (salad separately, obviously).
We don't eat a lot of pies but again, this can work well - the pre-made ones can fit in our air fryer so that works well as another "walk through the door and shove in the airfryer" option.
Pretty much any mince dish can be easily microwaved - bolognaise, shepherds pie, chilli etc.