Based on the Ek-sen-trik Discordian Holydays list, I have created a PDF rendition of a Discordian calendar in German (PDF) and English (PDF) that you can print out and pin onto your wall.

The code used to create the PDFs is written in Clojure and available under the terms of the AGPLv3+ as discordian-calendar.clj.

Have fun!