This website offers some free multiyear calendar templates since mid-2012. The templates are quite popular and have been actually downloaded more than 100,000 times.
Recently, Damian Strojec provided a Polish translation of the multiyear calendar template, which also contains the most popular Polish holidays. Thank you very much, Damian!
I added the Polish version to the table on the corresponding section for the multiyear calendar templates of the download page.