The Lohlunat, also known as "The Festival of the Moon" is a very popular Risian celebration. It was held at Suraya Bay on Risa. A Risian man told Ensign Hoshi Sato about this event and invited her to join this festival during her shore leave on Risa in 2152. (ENT: "Two Days and Two Nights")
In the game Star Trek Online, There is a Summer Event on Risa, the Lohlunat Festival.