Wow, nice pit, bro! I can't offer any help for cooking brisket for that many people, but I do wish you luck.
Jambo Pit - UDS - Lang 60 (Sold)
18.5" & 22.5" Weber Kettles - Smokey Joe and Mini-WSM - Bubba Keg - #2 La Caja China
Impeccably Accurate BLACK & RED Thermapens
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I am Obsessive Compulsive about BBQ. Google it.