A calendar is not difficult nor does it take long once you know where the dates fall.
Start with a basic month template table.
1. Click on the table icon on the Toolbar to create a basic table for one month
2. Click on the resultant table > Inspector > Table > Headers & Footers > 2nd button > 1
3. Inspector > Table > Body Rows: 6 > Body Columns: 7
4. Inspector > Metrics > Size > Width: 7 cm/in > Height: 7 cm/in
You can drag resize the whole month to your liking afterwards
5. Select the entire header row > Inspector > Table > Edit Rows & Columns > Merge Cells > Type in a month
6. Type Mon in first cell & Tue in 2nd cell of of 2nd row > Select both cells and drag the white dot in the bottom right corner sideways to fill the cells with the days
7. Do the same with the dates in the cells below
8. You can fill the spare dates at the beginning and end of the month if you like and maybe change them to a paler grey.
9. Style and position the text as you like it.
10. If you don't want to see the grid or want different strokes, colors etc:
Inspector > Table > Cell Borders/Cell Backgrounds etc
When you have the first month looking the way you want, option drag out copies sideways to make the rest of the months.
Peter