What about a “bar” of some type? Pizza bar w/ a GF crust option. Baked potato bar w/various toppings. Sandwich/burger bar (again w/ a GF bread option). Our favorite - roll your own summer rolls with rice paper wrappers (GF), veg, herbs, a few kinds of protein. I think people like interactive food? Especially if your celebration is more backyard casual than plated dinner. Assorted mezze could be an option too. Lots of dips and pickled veg, the meat can be chicken, the pita can be optional, you can do rice or bulgur as a starch, etc.
Otoh, if you aren’t looking for suggestions but simply commiseration, yes, it can be really frustrating to cook for a group where everyone has a different need or preference. Totally agree.
