Assumption Parish in O'Fallon, MO, invites you to Mass  to celebrate the Solemnity of the Assumption of the Blessed Virgin Mary, a Holy Day of Obligation. Vigil Mass will be celebrated at 5:30PM, Thursday, Aug. 14, and at 6:30AM, 8AM and 7PM on Friday, Aug. 15 in the Church. The Assumption of Mary is a significant event in the Catholic Church, commemorating Mary being taken up to heaven, body and soul. Come and be part of this heavenly celebration, where we honor Mary’s unique role in salvation history and draw closer to Christ through her example of perfect love and obedience.