Did you ever look for a simple calendar online, one you could download or copy, and finally decide that no such thing existed? If you do a search for "free calendar" or "printable calendar" you will see hundreds of sites but it may be difficult to find just what you want. However, there ARE many free generic calendars on line and knowing how to look may help zero in on what you want.
Keeping little hands and minds busy is essential for mental development, aside from managing kids out of trouble. However this may prove to be a challenge sometimes when parents run out of ideas. So be a step ahead and stay on the lookout for a variety of activities that are both entertaining and informative.