Grand National Teams is a National ACBL event that begins with unit level qualifying at local clubs from Fall to Spring, followed by District 17 qualifying in early Summer, and culminating with the national championship at the Summer ACBL nationals.
There is no limit on the number of games a club or unit may hold. Players qualifying at the club level stage are eligible to participate in the district finals. Anyone from anywhere is permitted to play at a club level game.
GNT teams consist of four, five or six players. There are 4 levels of competition: Championship (unlimited MPs, Flight A (less than 5,000 MPs, Flight B (less than 2,000 MPs, and Flight C (less that 500 MPs).
The latest available District 17 conditions of contest are at http://web2.acbl.org/documentlibrary/play/coc/gnt/17.pdf. They are generally updated late if ever.