You have plenty of food--baring "teenager" surprises.
I also would pre-cook the brisket to done and reheat on the party day.
And, that is simply to reduce the workload on "party day".
Your origonal plan would work fine--pre-cooking just makes it easier to enjoy the day!
"My son is graduating this month and he wants my brisket for the party instead of getting it catered – that’s my boy! I take it as a compliment and have no problem doing it."
Fine and smart youngster you have raised there
"Flirtin' with Disaster" BBQ Team (RETIRED)
FBA and KCBS Cook and Judge.
Former owner of a WSM, a Smokey Joe, a Charbroil Commercial gasser (junk), the legendary "StudeDera", a Fast Eddy PG500, and Sherman.
Now cooking with a Yoder YS640
Proud Pellet guy cooking on real wood.