Hundreds of events are planned around the United States today to mark the fifth anniversary of the invasion and occupation of Iraq. Cities holding protests, sit-ins and other gatherings include Washington, D.C., New York, Louisville, Chicago, Dallas, Miami, Los Angeles and San Francisco. On Tuesday activists with the antiwar group Code Pink marched along Constitution Avenue in Washington, D.C., disrupting traffic. Here in New York, the musicians Lou Reed and Laurie Anderson headlined a sold-out concert raising money for United for Peace and Justice and Iraq Veterans Against the War.