The only wrong questions are the ones not asked so never be afraid to ask.
Nationals is the AMHR big show. It's held in Sept around the first weekend in Tulsa, Okla. and lasts about 10 days. Tons ( pun there) of nice horses and lots of vendors with mini stuff. Loads of fun to attend. If you get there look some of the people from the forum up.
I will be there for the entire show. Stabled with Excaliber Stables in the Mustang arena building and also working between showing at the Royalty Resale booth ( help to support your registry Royalty!).