Having a calendar always open in front of you with your to-do list helps you better manage your time. Because we are talking about things to do, you need a method to easy reassign your priorities. This is why I like the idea of mixing a chalkboard with post-it paper.
People wither keep nearby a weekly or monthly calendar. You could write on a post-it the things that can be reallocated to another day since moving a post-it is easy. Write in chalk what you must do by a specific date. At the end of the month or week, plan the next one.
Using chalkboard wall decals or art work allows you to reuse the same support over and over. I particularly like this DIY weekly calendar featured on Ohdeedoh last year (top picture).
Scribble on Everything makes a weekly chalkboard decal set that is available in 2 sizes. It comes with a pack of dustless chalk and an extra space for taking notes.
Ferm Living makes a perpetual monthly Calendar Wall Sticker set. Their set comes with post-it. The day numbers are written on the stickers. Instead of moving around the day number, you could write what day it is. The mural measures 39 inch (100 cm) in width.