A music concert....in the basement?

Even though we have lived in China about a year and a half we still get things mixed up more than we'd like to admit.  Here's the most recent mix up.  Last Thursday our door lady stopped us as we were walking out the door to point out a recently posted notice.  She then pointed to the side of the building and started speaking very quickly trying to describe some sort of event.  She has a thick local accent and its difficult for us to understand her even when she only has a little bit to say, but this time she had quite a lot of information.  What we caught was that something was happening this Friday to Sunday downstairs underneath our building, 120rmb was involved,  and she made a gesture that implied that whatever she was talking about had to do with sound or noise.  So Sam asked if it had to do with music. (音乐）She said yes.  Sam concluded it was some sort of concert under our building.  We figured we didn't care to spend 120rmb to listen to music under our building so we disregarded the whole thing.  The next afternoon (Friday) as we walked out of our building a group of about five older women pointed to us and started saying that we hadn't gone yet to this "event".  I was really baffled. I thought to myself: Why do they care?  But then they mentioned the 120rmb again so I thought this must be some sort of fee that we needed to pay.  I asked one lady if the 120rmb was mandatory and she said yes.  I still didn't know where the music fit in, but we didn't have time to ask more questions at that moment because we had to meet up with friends.  Later that evening Sam got the whole story from a guy who owns the little drink shop next to our building. (He is also our neighbor.)  He said that there has been a lot of construction going on next door and the noise has "influenced" (影响) those who live on that side of our building.  Sam asked him why we had to pay 120rmb but the guy replied that we didn't have to pay 120rmb, they were going to give us 120rmb for our inconvenience.  We just had to go to a room below our building to sign a form and collect it during the times the officials were there Friday through Sunday.  The guy's wife offered to help us fill out the form when we decided to pick up the money.  What a relief!  Much better than paying 120rmb for a concert underneath our building, right?