Preliminaries begin at 10 a.m. with 26 bands from Oklahoma and Texas.
Parnell was a long-time band director at Durant High School and the marching contest is a tribute to his memory.
Bands will compete in Classes A, 2A, 3A, 4A and 5A.
“John Parnell was a really fine band director and he dealt well with students,” Southeastern band director Mike Raleigh said. “He was also a fine musician.”
The Southeastern marching band will present an exhibition performance at 5 p.m. prior to the announcement of the preliminary winners.
Finals will start at 7 p.m. and the Durant High School band will present an exhibition at 9:30 p.m. Winners will be announced at 10 p.m. Admission is $2 per person and approximately 4,000 people are expected to attend the contest.