Saint Mark Catholic School issued the following announcement on Dec. 08.
{December 8th- Solemnity of the Immaculate Conception of the Blessed Virgin Mary}
The Solemnity of the Immaculate Conception, also called Immaculate Conception Day, celebrates the belief in the sinless lifespan and Immaculate Conception of the Virgin Mary, it is celebrated on December 8, nine months before the feast of the Nativity of Mary, celebrated on September 8.
"O Most Holy Virgin, immaculate in body and spirit, look kindly on me as I implore your powerful intercession. O Mary, Mother of Jesus and our Mother, you intercede for us with your Son. O Mary conceived without sin, pray for us who have recourse to thee. Our Lady of the Immaculate Conception, pray for us." -Amen
Original source can be found here.
Source: Saint Mark Catholic School