Others said enough about prizes.
I respect my guests. Being vegetarian myself, I am trying to know in advance my guests' preferences -- and they are weird sometimes (no garlic, or no mustard, or you name it). But I am far from waging war on meat-eating: in fact I would go with friends to steak house without second consideration.
Inclusivity is a willingness to accommodate. It is respect to people preferences, regardless of small or big group they are. It is respect to event organizers: it would be nearly impossible to find venue. (I know vegans, and I know people who'd reject anything but meat -- any suggestion for a dinner place?) (In many events my lunch is "whatever you have vegetarian", and I have a backup protein bars -- but I consider it as my problem, not organizers'. They are busy, and I am grateful to them.)