To register your club or league you have to follow these steps in order:
Men’s National Championships Day 3
Men’s National Championships Day 2
Men’s National Championships Day 1

USA Cricket Statement

USA Cricket Announces Final Schedule and Live Streaming Plans for 2021 Men’s National Championships

USA Cricket Establishes First-Ever Umpire Appointment Panel and Announces Umpiring Appointments for 2021 Men’s National Championships

USA Cricket Announces Squads for Men’s National Championships 2021

USA Cricket Seeks Commercial Partners for Men’s National Championships
