St. Gregory’s Abbey in Shawnee hosted a Sesquicentennial Celebration on Sunday, Oct. 12, with more than 325 guests from nearby to across the United States, Mexico and France, according to Rt. Rev. Lawrence Stasyszen, OSB (Order of St. Benedict), Abbot of St. Gregory’s.They held a Sesquicentennial Mass in the Abbey Church that morning, followed by an outdoor barbecue luncheon, and Sol...