Travel / What to do in Warsaw at Christmas? [21]

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Christmas days in Warsaw 2017

Hi everyone!
We are planning a visit to Warsaw with my husband, we arrive on 23Dec and leaving on 28. As I know, most of places are closed on 25-26 but still would like to know if any museums, galleries, cafes (like starbucks or any pizzerias) are open on these days?

Also, I'd like to visit Cathedrals, is it possible to do on Christmas eve/Christmas day?

Thank you