Hmmm. I got Griff's email regarding the new schedule 10-1-19 . The first session was going to be the next day, so I thought he was cutting it pretty close. But he's a busy guy.
I also checked the AAP page and the new schedule was there, as well.
First thing I do is mark the dates and times on my calendar.
So I have the schedule in 3 different places.
I received the email regarding the time change for yesterday's session (10-9-19) on Monday, 10-7-19.
Griff also mentioned the time change at the start and end of Monday's "Boxes" session.
So he reminded me about that 3 times.
I also discovered why I wasn't getting email reminders for upcoming sessions. I had registered using a newer email account and was still checking in my "usual" account.
Lo and behold, I found all my reminders for the last couple of months when I checked the inbox of my new account, i.e. the one I actually used when registering.