tabbouli or Israeli salad, hummus, caponata, made dolmas....there are good brands out there wholesale, Cucumber Yogurt Sauce, huge green salad....maybe fattoush, I would not make falafel unless you have a deep fryer on site. Consider fillo "casserole" for lack of a better word......either cheeses (tiropete) or greens and cheese, or ground meat (birok sp?) or chicken?........someone serving to limit piggies.
Personally, I'd look at leaving out meat and making a total vegetarian meal...
Lots of pitas, pita chips, flat breads, interesting breads......
Make it look flush and huge.......presentation is more important.
I hope you are not providing the beverages, if so consider mint tea or Arnold Palmers.
Paper goods? Desserts? All the piddly addons will keep cutting the bottom line.
Hopefully you have linens, risers, large platters/bowls/baskets, props......I'd pull out the lemons, lemon leaves, copper/brass shtuff.