I would print out the bn tests and practice those, that should give you a good idea of what you need to work on.
I have shown at catalpa, although not for a few years, and it is the type of event where you do dressage and xc the first day and stadium the second.this means you need to wear your hunt coat for stadium.
As for braiding, you don't have to, but probably everyone else will be, so braid for dressage. You do not need s dressage saddle and you will not get marked down for not having one.
And have fun! Catalpa is a great event!
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