OK, guys and gals... looking for some input for my BBQ. Would like to get a rough idea as to whom may be coming or is at least planning on it. Want to have enough food and such.

Should I get a keg(pony) will it get drank? What about the Margarita machine? Don't mind having them if they get used. If not I will just have the fixings and a blender and a cooler or two of brews.

Just would appreciate the input!