This is a hypothetical case-study
The issue of the day is posted a few days in advance to a blog dedicated to letting other bloggers know about the issues. One of the editors of that blog learns that Americans for Healthcare Reform is planning to protest in five cities about the sorry state of the health insurance industry in the US. She contacts the activist group and gets their talking points and a press release and posts those as an upcoming issue of the day. Bloggers check the website and find the issue of the day, do a bit of reasearch and post their opinions on it and some links ot the website of Americans for Healthcare Reform and a few related groups. This takes place maybe the day before the protest, maybe a few days, maybe the day of, which ever is going to have the most impact. Then more people go to the protest than would have and folks suddenly become aware that we're the only country in the industrialized world that doesn't have national healthcare. Thus, the issue of the day works in concert with an organized event and the two work to reinforce each other. It's synergy.