I've been to a Polish wedding before (my cousin did pretty much the same). It's mental. Like going back in time to the early 90s, in one of those You've Been Framed! videos. They had some absolutely bananas cover band alternating between dad-rock classics (SIMPLY THE BEST, BETTER THAN ALL THE REST) and bobbins Polish music.
It goes on for two days, you eat nothing but their awful food and drink litres of neat vodka.