This is the 1935th most frequent Russian word.
району
"району" translates to "district" or "area" in English.
Here, 'району' is used in the prepositional case to indicate location.
Этот магазин расположен в центральном районе города.
This shop is located in the central district of the city.
In this sentence, 'района' appears in the genitive case showing possession or relation.
Местные жители района организовали праздник.
The local residents of the district organized a celebration.
The word 'района' is used in the genitive case as it connects with 'касающиеся' to denote relevance to the district.