The fourth interfaith prayer vigil will be held Sunday, Feb. 10, at 7 p.m. at Unity of Salt Lake, 7136 S. 1700 East. Ed Firmage, professor of political science at the University of Utah, will be the keynote speaker. Poet Emma Lou Thayne, Wendy Hansen Nazzel and others will participate in prayer, sermonettes and music. The public is invited.