On Sept. 15, from sunset until nightfall on Sept. 16, is Yom Kippur, “the holiest day of the year in Judaism…Yom Kippur means ‘Day of Atonement’ and repentance.” (Chabad.org) The day is observed with fasting and prayer.
I was brought up in a Baptist Church and as a child attended Wednesday evenings and the short period before Sunday services with my mother and sister. During these periods, members of the church “testified.” Their testimonies might describe illnesses, a lack of patience, “un-Christian” feelings or behaviors, financial woes as well as acknowledgments of blessings. The testifiers would end their testimonies with requests for those in attendance to pray for them for God’s blessings and/or forgiveness for any wrongs they had committed. It was not until I was a teenager that I learned that our adult Catholic neighbors went to “confession” to confess their wrongdoings and seek forgiveness.
Sept. 15 (annually) is the International Day of Democracy, a day to promote, uphold and commemorate the principles of democracy (so resolved by the United Nations General Assembly in 2007).
Sept. 21 (annually) is the International Day of Peace, sometimes officially known as World Peace Day, a day dedicated to world peace (so resolved in 1981 by the Secretary-General of the United Nations).
Sept. 22 is the first day of autumn.