You think that low Jl? I usually figure 1# of raw meat per person is a pretty good guideline, but I think you could be safe in knocking that down to 3/4# or less since it's a wedding and I'm sure there will be any number of elderly and children that won't eat their 1# of raw. Roughly 125 pounds of finished meat product is my estimate, best thing about it if you precook all the meats, you can just have the excess still in vac sealed bags, keep them warm in roasters in water, then just refreeze afterwards and you have meals ready to go at a moments notice. If it's being served, you can run lower numbers as well since you can control the portions, if it's buffet style, you might be better off staying on the high side. More than one person will have eyes way bigger than their stomach. As far as beans, I will typically just serve Bushs baked beans and go by the servings listed on the back of the Sams Club size cans. Potato salad, I use 5# of potatoes per 20 people. Can't tell you on slaw, it's just not that big here in Texas. Sauce you can offer a spicy, a sweet and middle of the road one and either just have them in warming containers or just in the squirt bottles near the meats.