I am planing a potluck, where there will be about 40 people and food that needs to be brought. There is a possibility that there will be people with dietary issues (kosher, halal vegan, diabetic). When sending out announcements, should I make some type of a note about this, so perhaps a few people might take that into consideration when deciding what to bring. I don't want everyone bringing salad, I don't want to feel like I'm singling these people out, but it would be nice if people did bring enough stuff so that those with dietary issues will have a nice time.
If I do decide to put something on the invitation, how do I phrase it? Should I phrase it, or just expect that if someone has a dietary issue, they can bring what they like?