Feeding 20.
That is ambitious. I organized an alumni group for the treatment center I went through, and we had picnics, potlucks, Halloween parties and so on. One lady proudly brought me a recipe for some sort of goulash or stew for 50 people, expecting me to make it as I was responsible for this gathering.
I laughed and suggested that I wasn't about to cook for 50 people. She had a ready solution - cut the recipe in half.
That wasn't going to happen, either, and if fact we weren't going to divide the recipe by 50.
But I admire you. 20 people is a horde as far as I'm concerned, and if you can feed that many yourself you are an organizational genius.
Have fun.