Structure is important in your rehearsal and your performances, and that is true of a performer on any instrument. Goals, lists, calendars are all tools to help keep you on a path towards achieving your performance goals.
But, one thing to keep in mind is the importance of freestyle improvisation on the drumset (or concert or marching snare, or piano, violin, etc., etc.). Letting your mind run free while your hands and feet create combinations seemingly on their own is extremely important to a musicians’ growth.
Freestyle improvisation is a great exercise for any drummer/percussionist out there building a solo piece for a performance or for an audition.