The Calendar is provided in
Adobe Acrobat
Portable Document Format (.PDF)
for online viewing.

Calendar

If you don't have Adobe Acrobat Reader download here FREE

Acrobat Download

When you install the Reader per the instructions you will find at the above site, it will be configured as a helper application for Netscape or Internet Explorer and will automatically open PDF files when you click on their link.

Alternatively, you may right click on the bulletin link,
save the pdf file to your system and
view it offline using the Acrobat Reader.