The nominal entry deadline for Carrier at the Nats is today. You can enter now and avoid a late entry fee. Also, the entries will be counted at this time to determine how many trophies will be awarded in each event, both official and unofficial. Go to the AMA website for the entry forms.
Although entries are supposed to be received today, reality says there is a grace period, so if your entry arrives this week, you re likely to be OK.
If you have been planning to enter, please take this as a friendly reminder to act quickly.
Pete