@Wende2 I don't think there's any way of turning those off without turning off the alerts you do want. Yes, I always found them annoying, I've always been well aware of my booked dates.
But I've also read posts where hosts got their dates confused and thought a guest was arriving the following day, so they might be useful to some especially if they have multiple listings.
But for hosts like us with one listing who are organized about their business and don't need those reminders, it would be nice to be able to block them. I sure don't need them reminding me 3 times that a guest is coming, or to send them check-in info.