No horseplay请勿打闹
rough horseplay at weddings同“闹房;新婚之夜;亲友在新房里跟新婚夫妇嬉戏逗乐;也说“闹新房”
No horseplay allowed不能打闹
N-UNCOUNT（不可数名词） Horseplay is rough play in which people push and hit each other, or behave in a silly way. 推搡嬉闹 [老式]