6 dated entries naming Mass (liturgy), drawn from 6 separate years between 946 CE and 1956 CE. Nothing here is written by us: each line is the sentence a Wikipedia year article used, and the link beside it opens the exact revision.
946May 26 – King Edmund I is murdered at age 25 by an outlawed robber while attending St. Augustine's Day mass in Pucklechurch (Gloucestershire). He is succeeded by his brother Eadred (or Edred) as king of England.source
13th century
1273October 6 – Thomas Aquinas, Italian priest and theologian, writes Summa Theologica, a master work of Catholic theology, leaving it unfinished, after having a mystical experience during Mass.source
15th century
1493December 8 – The first Roman Catholic Mass in the New World is celebrated, with Friar Juan Pérez of the Order of Friars Minor conducting the services at Point Concepcion on the island of Hispaniola.source
16th century
1534October 18 – Huguenots post placards all over France attacking the Catholic Mass, provoking a violent sectarian reaction (Affair of the Placards).source
17th century
1644A Spanish officer is murdered in St. Dominic's Church, Macau during mass by colonists loyal to Portugal during the Portuguese Restoration War.source
20th century
1956August 12 – Around 5,000 members of the Romanian Greek-Catholic Church hold a mass outside Cluj-Napoca Piarists' Church to demonstrate that their church, proscribed by the government in 1948, has not ceased to exist as the regime claims.source