I used a a 32×47 cm clipboard which I painted in blackboard paint. Once the paint dried, I drew lines and wrote the weekdays with a white permanent hobby marker. I then stated filling the table with the girl’s different activities with a piece of chalk, tied to the board with a piece of baker’s twine (cotton string). When we need to change something, we erase the text with a piece of damp paper or cloth. The lines remain, but the text disappears.
Do It And How 