R u a chef,
No, just like making a mess in the kitchen.
Is the Paczki Day in the beginning of January or at the end
I am not Catholic either, but I believe it has to do with the Lenten Period. The idea is to get all the good stuff in (food, drink etc...) before you give it up for Lent. This is similar to Mardi Gras in Nawleens (New Orleans) and other places.
edit: addition of en.wikipedia.org/wiki/Tlusty_czwartek