PeaceBang asked for a Sundays-only calendar template. Here's my first draft: both as a PDF and ODS, the later a spreadsheet that can be read and written in Google Docs and LibreOffice, besides other commercial spreadsheet applications.
New for 2020-21.. I'm amazed this blog post still gets a lot of readers, and requests! You can also edit the OSD file in LibreOffice and (so it seems) newer versions of Microsoft Office. I have included December 2020 and January 2022.
[From the original 2008 blog post]
(I have some liturgical calendars from prior years which need updating; I'll add these, too, when I've edited them.)