I assume you're asking about the H&H nationals and D-37 events. Paul covered that, you may need to get a D-37 card for "district" events. At a national, you're covered.
BITD is an entirely self-sanctioned orginization. Casey Folks runs, in my opinion, the funnest and safest events. He also sanctions the Adelanto Gran Prix: Formerly an A.M.A. sanctioned event.
We'd love to see you out here!
Best of luck,
Manny