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World Communion Sunday
World Communion Sunday is a celebration observed by several Christian denominations, taking place on the first Sunday of every October, that promotes Christian unity and ecumenical cooperation. The tradition originated in the Shadyside Presbyterian Church in 1933, was adopted throughout the US Presbyterian Church in 1936, and subsequently spread to other denominations. In 1940, the Federal Council of Churches (now the National Council of Churches), led by Jesse Moren Bader, endorsed World Communion Sunday and began to promote it to Christian churches worldwide.