It is a great mitzva to make a bride and group happy at their wedding because a new Jewish home is being created, so much so that despite the strict separation of men and women at the festivities, there is a "mitzva tantz" at the end of hasidic weddings where even the Rebbe dances in honor of the bride as do other rabbis, her brothers, uncles and father. The Rebbe is seen her dancing with the groom in front of the bride at the end of the video. Bobov hasidim split into ttwo factions after the death of the previous Rebbe. The rabbinical court they turned to said that there must be a distinguishing suffix to one' group's name and the number 45, for the street in Borough Park where this faction's main office was once located, was added.
