UMass police are preparing for another possibly rowdy concert at the Mullins Center in a few weeks after five people were arrested at a concert last Thursday. Police say two of those arrested at the electronic music concert allegedly injured people working the event. One worker's tooth was chipped when a suspect ran his head into the worker's face. Another four people were placed into protective custody. Officials are planning on another possibly busy night December sixth when another electronic concert comes to the Mullins.