I would do one this weekend.. but I just did a flat on Sunday. The wife got nervous because I only had one brisket in the freezer, and a lot of the local places don't carry brisket year round, only for holidays. We have a local-ish Costco that has briskets year round, but they only carry flats. So, with labor day coming up, she told me to stock up. I hit the local butcher and bought him out of every one he had. I think for the 20 pounder, I'll have to either cut it in half, or fold the end of the flat.
For this weekend, I've got 3 racks of St Louis cut ribs waiting in the fridge.