If you are registered for a national qualifier in USSSA but it get's rained out with no games played do you have to find another qualifier to get in or are you good?
USSSA nationals have no real requirements - unless you have never tried to play in a USSSA tournament - then they will require you play 'A' division. You tried to play, but couldn't so you will be eligible for A or B.
(Unless you are talking USA Elite in Kansas City which is different and requires qualification or at large invite).