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Canon LIV.
Canons of Local Councils Received Ecumenically (Ancyra, Gangra, Neocaesarea, Antioch, Laodicea) · The Seven Holy Ecumenical Councils
Members of the priesthood and of the clergy must not witness the plays at weddings or banquets; but, before the players enter, they must rise and depart.
LocalE 5.61.2
Christians are admonished to feast modestly when they go to weddings and not to dance nor βαλλίζειν , that is to clap their hands and make a noise with them. For this is unworthy of the Christian standing. But consecrated persons must not see the play at weddings, but before the thymelici begin, they must go out.
LocalE 5.61.7