Being a former team mom. Let other people help. Other Moms and Dads want to be involved so let them. I would do pulled pork and hot dogs, pasta salad, grilled corn on the cob, make homemade ice cream cookie sandwiches. Throw in some chips and maybe a veggie tray.
1) Do a pasta salad, basic nothing to fancy with Italian dressing style so it can sit out,
2) Ask another to provide the corn -grilled corn on the cobb is a super favorite. Soak the corn in the husk over night in water ,salt and sugar.. make sure to pull the silk out first, strip back the outer husk, not all the way just to the bottom pull the silk out, then pull the husk back up. Grill in the husk, when it smell like pop-corn its just about done, as far as butter mayo jars filled with melted butter is perfect, when eating pull back the husk, but leave it on it make's a kinda handle, perfect for dipping in the butter.
3)Another the cookies and ice cream - store bought chocolate chip cookies and vanilla ice cream - depending on the size of the cookies, you can use about half a scoop or less of ice cream.
4) Another the buns hamburger and hotdog - also ask for them to bring ketchup and mustard.
5) paper products - paper plates, plastic ware, cups, paper towels and /or napkins, also, toilet paper to replace what's used at the coach's house. Trash bags too.
6) Drinks - and ice ( I would ask a couple of families to bring ice it goes quick).
Make sure to have more than 1 cooler, 1 for clean ice to put into cups and others to keep the other drinks cool.