I should perhaps explain, for the purists, that I have used the first term for the counting method that Romans used in the context of days,
ante diem VIII Kalendas September
(Elighth Day to the Kalends of September)
rather than the naming of days for festivals:
August 25th was called The Opiconsivia. This day is sacred to Ops Consivia, or the earth-goddess, and is associated with the god Consus, but is considered to be the wife of Saturn. The shrine to Ops Consivia was located in the Regia and on this day the Vestal Virgins would have opened the room of sacred objects and performed rites unknown. The purpose of the rites was to ensure the fertility of the earth.
The Council of Nicea, in Greece, met this day in 325 and decided which books would form the Gospels and the New Testament, and which gospels and books would be excluded or destroyed. Among the losers were the Gospel of Thomas and the mystic revelation of John.