Canon LIII.
Canons of Local Councils Received Ecumenically (Ancyra, Gangra, Neocaesarea, Antioch, Laodicea) · The Seven Holy Ecumenical Councils
Christians, when they attend weddings, must not join in wanton dances, but modestly dine or breakfast, as is becoming to Christians.
LocalE 5.60.2
This canon does not call for explanation but for reflexion, and greatly it is to be desired that it should be observed by Christians, and that through like improprieties, wedding-days, which should be days of holy joy and blessing, be not turned, even to the bride and groom themselves, into days of cursing. Moreover the Synod of Trent admonishes bishops (Sess. xxiv., De Reform. Mat., cap. x.) to take care that at weddings there be only that which is modest and proper.
LocalE 5.60.7