This is a helpful calendar that I use for each semester that I teach - it shows a "semester-at-a-glace" so it's easy to EDIT, print, and write in notes to keep on track.
It's incredibly helpful to see all the dates, and block in all the units, on one page. It helps me stick to the overall plan.
Really, it's a life saver! I always send it to other teachers at the beginning of the year and they say how much it helps with long-range planning.
NOTE - the boxes I have written in work for my school board's dates, but of course you will edit it (it's a Microsoft Word file) to fit your own needs.