Performers who repeatedly cause noise nuisance could be blacklisted and retired police officers hired to step up enforcement under a raft of measures officials revealed on Monday to minimise the problem in public spaces.The plans were unveiled as lawmakers on the home affairs panel passed a non-binding motion to urge the Leisure and Cultural Services Department (LCSD) to review the rules to mitigate noise nuisance in parks, eliminate cash rewards for the performers and increase penalties.A…