Plus the program letter is a living document. You can change it at any time, as many times as needed during the yr. If my friend wanted to fly somewhere not listed in his program letter, he would write a revised letter, wait till Sat. to fax it to the FSDO, fly to the event on Sun. and the FSDO would get the amendment when they came in on Mon. morn after it was all said and done.

If it's an aerobatic plane, the FAA knows you'll be doing aerobatics. Just follow the operating rules for when, where, min altitudes and parachutes.