My watch, which quietly monitors these things warned me this morning that if I remained in a 100db environment for more than 30 minutes I could damage my hearing. Looking at the timeline it appeared to coincide with a game of Pin the carrot on the snowman at a local kindergarten yesterday afternoon. Even though there were only eight in the class the children got very excited!

Staff should be issued with earplugs. Shall raise the matter with management at the first opportunity.