You're cooking for 50 people for three days????? That ain't no small feat.
What about hobo meals? E.g., make 1/2 lb gound beef patty; wrap tightly in 2-3 layers of foil with chopped raw carrors, onion, potatos, celery all in the same foil pack. Season with salt/pepper, worchestershire. Freeze the packets. Throw them in fire coals for 30-45 minutes. Pull out and split top of foil packet.
50
EDIT: Just realized you're cooking only for yourself.