Hm, this site does say that there will be a fan zone in Hungary, but I honestly don't know anything else about it. https://eurovolley.cev.eu/en/women/tickets/
I am assuming that there won't be many fans at this place, because volleyball is still waaaay less popular than the other main Olympic team sports (football, handball, basketball, water polo, ice hockey) in Hungary with the exception of field hockey, which doesn't even exists here. I mean, our women's team had a couple of friendly matches before the ECh in another Hungarian city and the attendance was around 100. Most of the Hungarians don't even know that we are hosting this ECh.