A Betazoid wedding was a ceremony of the marriage of two people that followed Betazoid traditions.
During a Betazoid wedding, tradition dictated that all people present must appear without clothing at the wedding ceremony, to honor the act of love the ceremony commemorated. If the bride wished, she could choose to honor the wedding traditions of her groom instead. (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 would have followed all Betazoid traditions. Captain Picard's orders stated that everyone would respect Betazoid customs, despite Worf's objections. (Star Trek Nemesis)