My venue has an open vendor policy, but they do have an onsite caterer that you can use if you'd like. The onsite caterer is a little more expensive, but is convenient because they are onsite and have everything you need right there. Outside caterers are only allowed to use kitchen for prep and are not allowed to cook anything on site and must provide everything from napkins, silverware, glasses, etc. I'm still getting quotes from outside caterers but they appear to be about the same price or a little lower, but you get more for the money (ie better cocktail hour, or more menu items, etc). Would it be worth it to go with the onsite caterer juts to make sure everything runs smoothly and nothing is missing. Or save money by going with an outside vendor?