Go to the Catering, Vending and Cooking for the Masses section. There is a sticky with a couple spread sheets that do the calculations. How many adults and children? That will go along way in making sure you have enough. If there is a lot of teenage boys, plan on doing some extra.
Team: Pyle's BBQ; Yoder YS640; Good-One "Trail Boss" 60T; Homemade rig; 22" Weber Kettle w/rotisserie ring; Big A$$ Rotisserie; BGE-Small; Weber Kettle Gold, Weber OTS, New Braunfels offset smoker.
Saddles BBQ Bistro