Many people use printed versions of calendars. In the process of writing text by hand, the brain processes information and remembers. There are many studies on this topic that you can find in the public domain.
There are thousands of different free templates and september pdf calendar grids in the world to fill out by hand for every taste. There are strict and classic ones, there are multi-colored ones with photographs, there are dated ones, and there are no dates.
There are even whole communities of people obsessed with planning. Each of them is trying to create the best scheduler for their tasks and goals.