This movie is a mix of (1) a nowadays polish wedding including its aftermath, and (2) events that took place during WW2. The latter occured during both the Russian occupation - of the east part of Poland - as well as the later Nazi occupation.
The movies tries to show the viewer amongst others how a pogrom took place, whereby over 500 jewish people became victim of the hate of the local population.
Also, an attempt is made to show parallels between what happens in todays society compared with some of the events that resulted in WW2. As such, it can even be seen as a warning to the viewer that one does not let hate - towards other groups of people - escalate in a way that it consumes everything.
I personally would have preferred if a complete split was made between the events going on today and the ones in the past. Blending the events that are over 80 years aparts, may be artistically a nice move, but results in a too chaotic storyline in my opinion. Splitting them would have greatly benefitted the movie as a whole. I think that if the movie would have taken place for the most part during WW2, it would have easily gotten an IMDb score of at least +1 higher. Especially if you see how much effort was put in making the WW2 sets. Re-editing the current material might even create a movie that is a big improvement on the current state.
In its current state, I give this movie a score of 6.2/10, resulting in a 6-star IMDb rating.