Marching Band Action

Walking to class, a few of us stumbled upon this random marching band in the middle of the street.  We tried to ask what it was for, but didn't really understand.  We walked a little further and noticed that the entire street had been blocked off.  Firemen (bomberos) and police officers lined the street to conduct traffic.  Still don't have a clue what it was for, but it was pretty cool to see!