They are groups of neighbours associated in a legal entity. Several years ago (last years of the dictatorship and early years of democracy, here in Spain), most of this associations worked with the purpose of improve living conditions in each neighbourhood, even trying to participate in the development of the cities (urbanism, social services, etc.).Maybe You should explain this a little more
Nowadays, their main activities are festivals, holiday trips, and other entertainments. Even a lot of companies promote their products through the associations. Quite a change.
They pointed me to Belarus: go there, you will like it, you will find still more of the old ways there.
Some time ago I heard a Spanish woman saying something similar about Belarus in a TV interview.