Ah, no. I understand what the "!" means.
My main idea was just having a daily reminder to do something, I'm aware of it but a reminder on the side would help, except that having it in the calendar marks up all the days of the month with the "!" symbol
I meant to allow to optionally hide the symbol in certain events (or even have a different one as you suggested). If I for example just wanted to do an event with a daily recurrence it ends up looking like this.