Here are some resources for learning to read a calendar in Japanese.
The trickiest part is learning to read the numbers correctly. Print-kids.net has an excellent printable that shows you how to read dates, with accompanying worksheets, HERE.
from print-kids.net
Some more printable calendars can be found at Happy Lilac.
After you’ve learned how to read a calendar, I thought this game, by Tatsushi FUKUNAGA, was a wonderful way to review.
And here are some YouTube lessons on how to read a calendar in Japanese:
And here are some videos about how to say the days of the week in Japanese:
Hiragana Mama 
Great to watch your methods.