Normally, I get 1 pound raw brisket for every 2 people, It shrinks terribly. For a church function, if you pre-slice and have someone serve the first round, you can do 2 raw pounds per 5. Yes, you will be cooking 40-50 pounds of raw meat. I recommend the oven roasting steaming method for this much.

You need to also cook plenty of potatoes and carrots with this meal. Rutabagas and turnips are traditional in Ireland, and you might consider adding a rutabaga dish (sweeter than turnips).