On August 28, 2017 two holidays were celebrated at Unification Sanctuary.
Significance of the "Declaration Day of God’s Eternal Blessing" – 7.1. Jeol (Chil Il Jeol) Established in 1991
The first ceremony for the “Declaration Day of God’s Eternal Blessing” was held at 7 am on July 1, 1991 at the Hannamdong residence in South Korea. Circa 2,000 people were there that day at the event. All blessed families were asked to submit their application for becoming a tribal messiah during this event. Thus, this day is also called the Tribal Messiah Declaration Day.
The following are excerpts from a public letter and memorandum to organizational representatives written by Rev. Hyung Jin Moon (in 2009) explaining the significance of Chil Il Jeol:
“Declaration Day of God’s Eternal Blessing was held on July 1, 1991 in the International Training Center at Hannam-dong, Korea. On the occasion of the 10th anniversary on July 1, 2000 the name was changed to 'Declaration Day of the Victory of God’s Eternal Blessing.'
"It is written in Genesis 2:2, ‘By the seventh day God had finished the work he had been doing; so on the seventh day he rested from all his work.’ Through this declaration, God’s Sabbath was established. God’s blessing was now eternal and unwavering. In that light, the 'Declaration Day of God’s Eternal Blessing' was designated as the seventh Holy Day."
"In declaring Chil Il Jeol....the era indicating the responsibility of the parent had come to an end, opening the era of the children’s responsibility. This era refers to the era when blessed families, as tribal messiahs, inherit True Parents’ realm of victory. At the time of the declaration of Chil Il Jeol, all blessed families worldwide began their mission as tribal messiahs. Thus, this day is also called the Tribal Messiah Declaration Day.'"
"Before designating Chil Il Jeol, True Parents had all blessed families submit the 'Tribal Messiah Activity Application Form' and emphasized ‘Do not forget that all blessed families without exception have the mission to establish the realm of victory in which Satan is immobilized, by establishing the standard of restoring the right of the eldest son, the right of the parent, and kingship – lost by Adam and Eve – in their families according to their connection with heaven.”
 June 24, 2009, Hyung Jin Moon, [Ref. No. 2009-33]
Significance of the "Declaration of the Realm of the Cosmic Sabbath" – 7.8. Jeol (Chil Pal Jeol) Established in 1997
At 7 minutes and 7 seconds past 7 am, on the 7th day of the 7th lunar month in 1997, Rev. Sun Myung Moon, True Father, after he turned 77 in age, made the “Declaration of the Realm of the Cosmic Sabbath for the Parents of Heaven and Earth.” This declaration was made at the Central Training Center in Suaek Dong, in Guri city of Gyeonggi providence, in South Korea, in the presence of 7,000 event participants from around the world. (This was on August 9, 1997 – by solar calendar – i.e. by the Gregorian calendar). True Father named the declaration “Chil Pal Jeol” and it was reported he said that it was the “holiday of all holidays.”
He declared in his benedection prayer on that day:
“Beloved Father! Today, 1997, July 7, 7 hours, 7 minutes and 7 seconds, centering on the 3.6 Million Couples Blessing, we have accomplished this year’s motto, ‘Let Us Be Proud of True Parents and Love True Parents by Accomplishing the 3.6 Million Couples Blessing.” 
He further stated in the prayer:
"Your son, Sun Myung Moon, who has lost the dream of his youth, of his 20’s and 30’s, while inheriting and tolerating the big heart of Heavenly Father, has conquered the hills of 40 years of agonizing history, while overcoming numerous failures that are filled with insults and bitterness." 
He declared this in his benediction prayer:
“Today, Your son by the name of Moon celebrates his seventy-seventh year in this world. The era has come in which we can connect the Sabbath year with the number of a new beginning, rising above the numbers seven and eight by connecting eight number sevens based on 7 minutes 7 seconds past 7 o’clock of the 7th day of the 7th lunar month in 1997, and my 77 years of age. Now, therefore, Unification Church members can form families inheriting the heavenly authority and traditions of love, and thus attend You and offer You a dwelling place on the levels of nation, world and cosmos. Through these families, the foundation of the Sabbath in which You and the True Parents can freely come and go will be connected from the family to the cosmos. The time is close at hand when we will cross the boundary that separates us from the simultaneous establishment of Your right of kingship on earth and in heaven, which will allow us to achieve complete oneness with You. In such a manner this work has been accomplished.” 
He also stated in this benediction:
"Heavenly Father, please take pleasure in welcoming this era in which You can be liberated from imprisonment, and in this state of liberation embrace Your loving cosmos, through the establishment of the Sabbath foundation of the eras of the right of kingship in the family, nation, world and cosmos, which has been Your long-cherished desire."