To edit the calendar, here is a video of an older (northern) calendar being edited. Basically, if not edited, it may simply be printed and there will be no blue squares that print. If edited, the blue squares also do not appear — just the text entered.
The seasons printable has milk caps (or print the circle pictures on card stock) for children to work with pictures representing the changing seasons. This printable is correct for the Southern Hemisphere and opens here.
These are Northern Hemisphere pages on trays ready for use, but the idea is the very same.