arg - figured it out. If you go to "my itinerary" then your reminders et. al. will show up and if you click on one it will bring up the details where at the top is an option to "remove me from this..."
My problem wasn't removing our major-park-of-the-day reminders for a day - rather I couldn't get to something I put in the middle of the same day. It turns our that while reminders print out in chronological order, the MDE screen is in park order - so I just had to scroll down farther to find middle of the day reminders.
Our Authorized Disney Vacation Planners are here to provide personalized, expert advice, answer every question, and uncover the best discounts.
Let Dreams Unlimited Travel take care of all the details, so you can sit back, relax, and enjoy a stress-free vacation.