JRiha
If you plan to go to the rescheduled national next year (same location) you don’t need to request a refund, as your registration will automatically be transferred.
You also have the option of obtaining a voucher for your registration fee plus an additional 20 percent to use toward any MOA getaway if you want to go that route.
Otherwise you can request a refund.
See https://rally.bmwmoa.org/need-a-rally-refund/ for options.
Jerry