The first day of February of the lunar calendar is the day to serve the deity called "Yeongdeungsin" who brings rain and wind. The god is also called "Grandma Yeongdeung." The belief that Grandma Yeongdeung descends on the first day of February is the same all over the country, but the day falls on the 3rd, 15th or 20th day depending on the region.
By looking at the weather on the first day of February, people used to predict the harvest for the whole year, and thus the future would depend on whether Grandma Yeongdeung brought her daughter or her daughter-in-law to the earth. If she brought her daughter, the weather would be balmy, but if she brought her daughter-in-law, the weather would be harsh or stormy. Her daughter's coming would also bring wind, so her skirt would flutter pretty in pink, whereas her daughter-in-law's coming would bring rain, so her skirt would get wet. However, the rain was believed to make a good harvest.

영등제 관련 자료

Yeongdeunggut Exorcism and Ttibae Boat in Chilmeoridang Hall, Jeju Island

Yeongdeungje was a folk custom universal enough to be recorded in the ancient record "Dongguk Sesigi" (東國歲時記, A Record of Seasonal Customs in Korea). In Jeju Island, a large lantern festival (燃燈祭) is organized to serve the god called "Yeongdeungsin" in February of the lunar calendar. To please this god, the organizers decorated the pole with silk and "Maryeong" (馬鈴) and performed "Yakmaheui" (躍馬戱), a closing ceremony in which a small rafter made of straw carrying offerings is floated offshore to bid farewell to Grandma Yeongdeung. During the festival, seamen or divers do not go out to sea.

The procedure of the "Yeongdeungje" ceremony held in Jeju Island is as follows:  
① A tall pole is erected. 
② Chogamje Ceremony: The basic format of the prayers made to all gods. 
③ Welcoming the Dragon King of the Sea (龍王): The ceremonial procedure for welcoming the Dragon King of the Sea and the Yeongdeungsin God.  
④ Ssideurim, Ssijeom (Planting Seeds Ceremony): The act of “planting seeds” refers to the belief that the Yeongdeungsin God planted seeds of seaweed for female divers. 
⑤ Jiaroim: The participants wrap a small portion of the ritual offerings in white paper and throw it into the sea.  
⑥ Sanbadeum, Aekmagi: The participants have their fortune for the year told, and the entire village and villagers drive away the evil spirits, or "Aekmagi." 
⑦ Baebangseon: This ceremonial procedure consisting of seven steps has the purpose of sending off the Yeongdeungsin god to her rightful place. A small boat made of wooden planks is made first, and then floated off to sea laden with various offerings.