I struggle with the same organization and planner difficulties. Currently, I put the appointments in my iphone calendar first. Then when I get home I transfer the appointments to a large calendar on my wall that’s right next to my door in order to make sure I see it everyday when I’m going out the door. I like the Large “At a glance” wall calendar. It has lines to write on in order to keep it looking neat. It also has a place at the bottom for notes. That part comes in handy.
Also, I noticed you wrote you were starting DBT. I have been going to a DBT group for years and it has helped me organize my thoughts and changed my behaviors that have drastically helped my ADD.
I got a lot of new great ideas from reading these replies. I’m always looking for ideas for organization and time management.