Larry, This is from the NHRA website. No one can enter after the field is closed.
Provisional entries must enter the event online at
www.nhraeventreg.com
prior to the deadline date/time (1:00 PM
Pacific time Monday of race week). Provisional entries WILL NOT be
accepted after the event deadline date/time. A provisional driver that enters an event and then withdraws, will NOT be allowed to re-enter.