Let me start by saying that I absolutely 100% intend to feed my vendors. I know the coordinator, DJ, and photographers who will be there all day have to have a meal and I would absolutely never even think of not providing one.
My question is for the ceremony musicians. If they're only there to play for the ceremony do they need to be included for vendor meals? They will not be playing for the reception at all.
If it were one or two people, I wouldn't even worry about it, but FH has his heart set on a small wind band playing for the ceremony instead of your usual string quartet or piano (or recording). FH is a band director and I play flute and "band" is very important to us. I'm just trying to decide if I need to be planning on feeding these extra 10-12 people.