In 1908, the Rev. Paul Watson proposed a week-long observance dedicated to Christian unity to be scheduled between the feasts of St. Peter’s Chair (January 18) and St. Paul (January 25), the two great leaders of the first Christians. The World Council of Churches maintains these dates. Each year an inter-denominational committee selects a scriptural theme and prepares the outlines of a worship service for each day of the Week of Prayer. Individual congregations are free to use the material as is, or vary it to suit local practices and traditions. Discuss
Source: The Free Dictionary