A Betazoid wedding is a ceremony of the marriage of two people that follows Betazoid traditions.
During a Betazoid wedding, tradition dictates that all people present must appear without clothes at the wedding ceremony, to honor the act of love the ceremony commemorates. If the bride wants she can choose to honor the wedding traditions of her groom. (TNG: "Haven", "Cost of Living")
After their wedding in Alaska, in 2379, William T. Riker and Deanna Troi planned a second wedding on Betazed, which will have followed all Betazoid traditions. Captain Picard's orders stated that everyone would respect Betazoid customs, despite Worf's objections. (Star Trek Nemesis)