While we haven't desiganted all fridays, up here in Canada we have had several rallies organized where everyone in attendace wears red in support of our troops.
Back to Vabowman's comment, yes, you can support the troops and not the war. Very few Canadians support the war, but the vast majority will tell you that they support our troops. Recently we renamed a stretch of one of the heaviest travelled roads in North America the "Highway of Heroes" because our fallen soldiers travel it between CFB Trenton and our forensics centre in toronto. Each fallen sodier that travels this stretch is greeted by supporters and emergency vehicles with all their lights flashing on the overpasses.
Here's a link:
http://www.citynews.ca/news/news_14055.aspx