KPFK, the Pacifica radio station at 90.7 FM, says it will mark the anniversary of the "great Immigrant Rights March of 2006" with 24 hours of progressive Spanish-language programming. KPFK routinely airs some content in Spanish, but on Monday "the station will flip to all Spanish for 24 hours in recognition of this programming, and to honor of one of the largest demonstrations in the history of Los Angeles." That was the day as many as half a million people gathered outside City Hall and on downtown streets to show their support of immigrants. "A sea of white shirts and American flags," says the station's flackage. "KPFK was there - broadcasting from the lawn of City Hall."