The National Foundation Day (開天節):

The Old Joseon descendants in Manchuria had a unique festival written as “祭天大會”, literally a large public gathering for the ritual service to the Heaven. Korean declare the phrase as the National Foundation Day (開天節) and cerebrate on October 3th.
It is well documented in the Chinese scriptures under Dog-yi section with different names . It was a few days long holiday to celebrate the mythical Hwanung (桓雄) descended from heaven to the earth.
It was started from the birth of Old Joseon, Asadal. They set up a Totem pole(雄常) as a symbol of Hwanung came down (降) nearby the Sukshin (肅慎) and Buyeo village (胡不與之國) of Hu people in the northern Shanxi Province .
Chen Shou described this festival by segments in the different region and diluted the true meaning. He named as Yeonggo (迎鼓) of Buyeo; Mucheon (舞天; dance for the heavenly god) of Yemaek, Dongmaeng (東盟) of Goguryeo, So-do(蘇塗) with another PSMCs Yeonggo (鈴鼓)in the section of Hahn, and so on. Some of them are worthy for discussion.
The ideograph Go(鼓)in the Yeonggo (迎鼓) of Buyeo was explored. Their ancestors came from somewhere (說古之亡人), spoke the Qui language(竊語) that Yae-Maek people in the Shanxi province used. Buyeo Capital has the Citadel of Yae (濊城) and the seal of Yae Wong. The whole Manchuria was the land of Yae-Maek people .

Goguryeo section had unusual name Dongmaeng (東盟), literally made a pledge of an alliance in the east, which is the same phonetics of the current word (同盟) and semantic . Most likely by the time Chen Shou was active, Goguryeo people pledged to make alliance and reassured to take back the lost territory by proclaiming Damul (多勿; 다물=되물려,meaning return) at the ritual ceremony.
The ideograph Shin(神) is referring the God also interpreted as Spirit . The ideographs Susin (禭神) was a metaphor of Hwan Ung and being described with different ideographs such as “隧神,名隧穴, 木隧”, so on. It has a meaning of the God, the fire maker Su-rin (燧人,炎帝, 赤帝) with the Flintstone. The ideographs Susin (禭神) shares the same phonetics and semantic with the Sukshin(肅愼; 濊) tribe of Hahn-Yae people, the core member of Old Joseon along with Buyeo and Xiantu . The ideograph “絳” had been used to describe the Feng Creek (汾水) in the Shanxi province, where Sukshin(肅慎) tribe lived. They presented the Bow and Arrow. Xiantu (玄都氏) presented the gem(寶玉) to the Shun yú (舜虞). Both of them were described with many ideographs . Hence, the original meaning and locations had been diluted.
The name “蘇塗” in the section of Hahn(韓傳) deserves further discussion . First: It was described under different section; such as Dong-yi, Mahan where Baekjae(伯濟), country of yuè zh (月支國) from the west, and country under the Queen Bimiho had been the same region. The same name had been as the Turkic Khaganate (突厥) in the west as well . Second: The Turkic Khaganate worshipped the Heaven (祭天)every season. They interpreted the ideograph Sky“天”to 纛” that is the compound ideograph meaning the province(縣) of Du (毒). The ideogram Duk“纛” has been used as the flag of Chiyou (蚩尤), the leader of Nine Li tribe and applied to the small island (纛島; 뚝섬) in the Hahn River nearby Seoul Korea. Third: The ideograph Do(塗) is another PLC of the Do(兜) same as Du(두목, 兜牟=spear head) meaning the Head. Fourth: They replaced the large drum Yeonggo (迎鼓) of Buyeo to another PLC (縣鈴鼓)and replaced as a small ornaments attached to the three, totem pole. Fifth: Chen Shou used the tribal town Buyeo(不與, 胡不與之國) as noun word and also interpreted as not the same. Hence, later scholars misinterpreted about the culture of Three Hahn .
Korean historiographies didn’t describe in detail. Samguk sagi stated only by citing the Book of Later Han and history of Northern Dynasties . By the era of Goryeo dynasty established, Koreans in the peninsula lost the origin of this event, but variant forms still remained. The Totem Poles had changed to the Sotdae(솟대), Seonangdang dedicated to the Seonangshin (서낭당. 서낭신, 성황, 城隍堂), hareubangs (하루방) in Jeju island, and mileage sticks in between the villages.
Baekjae that is the descendent of Buyeo provided this special ritual ceremony to the Heaven and Earth (祭天地) in the first month of Spring with drum (用鼓吹) at the altar in south . It was in the first month of the year (시월 상달, 以臘月祭天) that is October. They misunderstood that Baekjae used old (顓頊曆)calendar.
Tong-dian revealed the elusive wordings that Chen Shou left. White outfits and Calendar was not from the southern (殷, 衣尚白) culture. Rather this ritual service was similar to the culture of Bei-di (北狄, 貊, 白狄, 白翟) also known as Red-di (赤狄, 蓋狄) who used to live in the Fenshui(汾水) collider, Feneum(汾陰)where the emperor Wu of Han found the symbol of heaven mandated authority Jun(鼎) in the Shanxi Province . They all dressed up well and set the well decorated totem pole . Wearing white garments was the custom of Hae=Maek people . This white garment is called Do-Po (道袍, formal attire of priest, for ritual service and pray) in Korea.
They set up a Totem pole as symbol of decorated with fabrics and worshiped to the heavenly god. Totem pole (雄常, 伺琅玕樹) custom appeared in the Shanhaijing by the town of Sukshin and Buyeo . The Shanxi Province where Buyeo (胡不與之國) and Xiānbēi (鲜卑) had been for long time. After Han invasion in 108 BC, they ran away to the north and through the sea route north east Asia and western part of new continent including Hawaiian Islands. The totem pole reveals their origin.
The son of small brightness(少皞; 少昊，金天氏),Ban(般: bān bō pán bǎn), leader of Buyeo (東夷) made the Bow and Arrow . He was described as a subservient of Yellow Emperor . He as a leader, also got a lots of nick names and ideographs; Do(兜) is one of them.
By reviewing the scriptures, So-do(蘇塗), literally mud painted leader came back, was noticed in the region around the Gate to the Sea. They spread out through the sea route along the coastal region of Hahn-Hae . They described this joyful event combined with Chuseok and Dan-Oh festival (秋夕, 端午) together. It is related with Do-Solo Song(兜率歌) and Mireuk (彌勒) in the ancient Silla. Do(兜) is another PLC of meaning the leader written as the Hwan-Do (驩兜, 驩頭) in Shijing and Shang Shu . The Leader of Buyeo(浮游, 夫餘) was written as Do(兜). Chen Shou stated that So-do (蘇塗) was similar to the Buddhist temple compound . It was the large courtyard building “彌勒大院” built during the 5th King Chogo (肖古王: r. 166–214) of Baekjae in the Haeha(海河) watershed area in 171. The folk lyric of Silla has the phrase(起舞嘆曰：會蘇, 會蘇曲) : Lets stand up and sing a song to meet the leader resurrected.
It was the beginning of Silla folk song originated for joyful event (歡康) around the Tianjin vicinity nearby the Continental Baekjae. Every villages of Balhae territory in the Manchuria had the temple with the Hwan-ung (天雄寺) statue. The Hwan-ung statues were replaced to the founding father of Khitan . They built the main Hwan-ung temple in the Lulong County (盧龍縣) by the Qinhuangdao City, in northeastern Hebei Province.

In summary: The unique festival that the Joseon descendants cerebrated in Manchuria had been described with various activities and names. It was a large public gathering for the ritual service to the Heavenly god who sent a group of people under the leader Hwan-Ung to provide the Peace and Prosperity. It is joyful event, extended to Chuseok, and Dan-Oh festival in Korean culture. As Buddhism arrived, the Mireuk (彌勒) and Dosol-song (兜率歌) had been painted as Buddhist custom in the Silla.
The etymology of Sushen(肅愼) tribe related with the their respect of brightness coming down from the sky. They celebrate this special event on October 3rd after finished the harvest as the Day of National Foundation and beginning of a new year. The similar culture and events are the Jewish New Year, Rosh Hashanah (Hebrew, literally meaning the head of the year, same as Sang-dal in Korean word), Octoberfest, Thanksgiving Holiday. The Totem poles and hareubangs are the physical evidence.

End.

May 14th, 2020