Here is the net for a dodecahedron calendar designed to be printed onto card. Carefully cut out, score and fold along the joining lines. Finally glue the tabs to make the useful platonic solid. [Select "Print background colors and images" before printing.]
Calendars for other year's are available in a crisper pdf format (thanks to Ole.Arntzen at https://folk.uib.no/nmioa/kalender/):
See also The Great Dodecahedron
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Here are some other activities with a calendar-related theme that you may be interested in:
"Calendars..., their days are numbered."