The calendar in question is a standard-size printable calendar, which you should be able to discover in any workplace supply store. You will want to download the calendar onto your computer system first, then transfer it to your hard drive.
When you have saved the calendar onto your computer, it will need to be converted into a PDF format. Merely search for the appropriate file type, then follow the on-screen guidelines to conserve it as a PDF. It is highly most likely that October 2021 will be providing lots of various templates.
Image source: calendarzoom.com