Weltgebetstag
Two other Christian denominations celebrate a World Day of Prayer in September. Firstly, the Unity Church, a New Thought Protestant denomination headquartered at Unity Village, Missouri celebrates a twenty-four-hour World Day of Prayer, principally on the second Thursday in September (member churches may start at sunset on September 11, and the themes differ from those of the Women's World Day of Prayer set forth below). And secondly, the terrorist events of September 11, 2001 prompted the Knights of Columbus, a Catholic fellowship, to designate that date annually as a World Day of Prayer for Peace.