Most of my teaching is 1:1 which means I can book students from week to week. The upside is that I can slot these students into free spaces in my schedule, like a jigsaw puzzle. The downside is that I don’t have a good overview of my week until the end of Friday the previous week.
I also have approximately 16 groups of 4 – 8 students each. Some groups are weekly, some are fortnightly (a word which I believe is not used in the US?), and each course usually lasts 12 sessions. The advantage of these groups is that they can be booked into my schedule way in advance because they are fixed. The disadvantage is that it takes so long to write all these bookings into my calendar in advance. I also often forget the exact times for each group at the beginning of the course, because I can have up to ten groups beginning in the same week.
You can see my solution for this below. I just bunged washi and stickers on each page to remind me not to book anything at those approximate times, and wrote some times on a page at the front of my planner. Once I remember those I can throw the paper away. I am not tidy and I am not a natural decorator, but it is very functional and works for me.