If you sign up to speak during Public Participation, then show up.
Whose brainchild was the electronic advance registration system? Did that person anticipate no-shows? How many times have speakers failed to approach the the microphones after their names were called?
Should registered speakers have to "check in" upon arrival? Can you still register in-person before 6:15PM?
If you change your mind, notify the Assistant to the Board, Christine Lewis, at firstname.lastname@example.org
Cancellation is a common courtesy to the board and to the public.