From: actagainstwar.org: a call for Emergency Mass Non-Violent Direct Action & Protest the day after a war starts:

Don’t go to work or school. Call in sick, walk out, don’t go—and get your co-workers/ schoolmates to join you. Head downtown-- leave early or come the night before-- things may be jammed in the morning. Or ride your bike and join Bikes not Bombs. Bring friends, music, art, performance, and food to share. Join / create an ongoing transformation/occupation.