In any single plain page-
- Position the cursor where you want your calender to appear.
- Click the calender icon next to the tables icon on the toolbar.
- Choose which type of calender you want (experiment with the different types if unsure)
After inserting the calender you can modify, inserting links, pictures etc
The calenders will need to be updated, and old months deleted, so make a dairy note or alarm note to regularly do so.
There is also another type of page where events will automatically insert into the right place, and old events will delete, but not everyone likes that format.