Couple Conducting Nikah Ceremony Twice As Per Their Own Sects
Nikah is an open declaration of a contract by a man and a woman to live permanently as husband and wife. Therefore, conducting such activity once is enough for Nikah to be legal in Sharia. If a couple, due to societal reasons have to conduct the ceremony twice, then the second time would only be a formality because Nikah had actually happened when the first time such a declaration was made. To understand what is Nikah , please refer to the video below from 25:03 to 26:38 https://youtu.be/gXsanV9ncFA?t=1503