Life / Christmas carol singers - is this a Polish Christmas tradition? [13]

That is an example of a somewhat obscure Polish Christmas tradition, where a band of people dressed up as various characters from traditional Polish nativity plays would do some caroling or make a short performance in an effort to collect some money or food from other people. Call that 'creative begging' if you will. The closest equivalent in the US would probably be the Halloween tradition of trick or treating.

However, this custom is now very obscure except in the countryside and possibly some suburban areas where kids are poor and creative.

Genealogy / Looking for Narymund-Waszklevich [4]

Your chances are rather slim IMO, since such documents will probably not be available online. Do you happen to know the place of birth of your mother's ancestor ?

UK, Ireland / Where to buy Żołądkowa gorzka, cherry with honey in Dublin? [4]

I know it might not exactly be what you are looking for, but I recommend you make yourself a proper dram/cherry-infused vodka with whatever brand of vodka you have available and some cherries. It will take around a month though but is far better than anything store-bought anyway. Trust me...

Just search google for anything like "homemade cherry dram or liquor".