On 15 February 2003, a coordinated day of protests was held across the world in which people in more than 600 cities expressed opposition to the imminent Iraq War. It was part of a series of protests and political events that had begun in 2002 and continued as the invasion, war, and occupation took place. The day was described by social movement researchers as "the largest protest event in human history".[1]
https://en.m.wikipedia.org/wiki/15_February_2003_anti-war_protests
tbf this is more like driving out recruitment offices one week after 9/11
That's almost a year and a half after the invasion of Afghanistan. There was absolutely no antiwar protest on October 2001.