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butter and onion potatoes for 500
We are planning on feeding 500 people this weekend for a memorial golf tournament. One of the sides is buttered potatoes with onion. We will be cooking them in roasters. I need to know how many potatoes, how many roasters, cooking times, and any other information you can provide. We are also doing pinto beans, so any information you can provide for cooking for the same number in roasters for beans, would be greatly appreciated. Thanks so much!
First the caveats: roasters only hold enough for 50-60 people, so you are talking 18-20 roasters. This could blow every circuit in the place. If you have ovens, you may want to cook in the ovens then hold and serve in the roasters.
Also, you will need about 10 double-sided serving lines to serve all these folks in under an hour.

For beans in roasters, see the bean page:

You planning to boil or bake the potatoes? It sounds like boil. You have to allow at least 40 minutes to bring the water to a boil, then add 12-15 pounds of potatoes, cover and simmer stirring occasionally until done, which can take anywhere from 40 minutes to almost 2 hours, depending on the size of the potatoes. Then you have to drain these large heavy pans!

You need 30-35 pounds of potatoes per 100 if this is the only starch dish, 25 if rice is also served.