Just thinking of some more ideas.
You could do a ramen noodle / pho noodle soup bar. Have a giant stockpot of soup broth and a couple big pots of cooked noodles of different types if you want. Then different protein and garnish options laid out for people. Ex: cooked & sliced chicken breasts, rare sliced beef, bean sprouts, tofu, mushrooms, lime, basil, etc.
A big tray of chicken drumsticks for dinner or possibly for snacking during the day.
Roasted vegetables in large quantities. People could add those to quesadillas, wraps or sandwiches.
Breakfast stratas — make a couple and those should give you about 20 servings — sallysbakingaddiction.com/spinach-bacon-breakfast-strata/
Or eggs / omelettes baked in muffin tins. Then you’d have lots of mini muffins for people to choose from and snack on
Breakfast sandwiches copycats. Get sone English muffins, sausage, eggs, etc and people customize.
Sheet pan giant pancake so you can feed a crowd quickly — www.thekitchn.com/sheet-pan-pancakes-recipe-23059380
YES to cooking bacon in the oven. It’s so much easier and you can do them in large batches too.
A large pot of Mexican black beans. They’re very flexible and delicious. Eat them as a side, over rice, nachos, in quesadillas, in breakfast burritos or regular burritos.
Fresh fruit! Cut up pineapples, etc so everything is ready in the fridge. That could be the kids’ job to make a fruit salad or plate every day. Also have them find hearty winter salad recipes too so they can experiment and get some vegetables into everyone.
This all sounds so fun @Westofeasttoday. I love cooking for a crowd!