The Fekete Sereg Youth Association is a non-governmental organization, based in Nagyvázsony, whose main aim is to provide a useful pastime for young people from Nagyvázsony and the surrounding area. In 2022 the Volunteer Center Foundation awarded the Vázsonykà  project as the "Best Volunteer Program of the Year" in Hungary.
Fekete Sereg literally means "black army", which was a common name given to the military forces serving under the reign of King Matthias Corvinus of Hungary. The most famous general of the army was Pál Kinizsi, whose central estate was the Castle of Nagyvázsony. For this reason, the founders decided to name the association in honour of the famous general Kinizsi.àThe Kinizsi cult retains its importance to the village even in modern times. For example, the name of the castle is "Kinizsi-vár" or "Castle of Kinizsi". Overall, the name symbolizes the cult of Kinizsi and the attachment to local traditions.
The Association has several activities targeting students, unemployed, minorities (gypsies), disadvantaged and handicapped people. The activities include: