What about a Pallea? It's fun, rice based and you can add any ingredients that you want...chicken, fish, shrimp. I would ask your guests what they would like in it. If you don't have a Pallea pan, you can use a skillet, or casserole dish.
You've really got to be careful with cooking for gluten sensitive people. Some folks can be highly intolerant. I have a friend who got severely sick just by making a sandwich for her husband, slicing it and then using the same knife to slice her own, gluten-free sandwich. The crumbs on the knife were the culprits.
~ C