What's funny about these "day without an 'X' " race/gender/whatever things is that pretty much the only people that will participate are the unemployed, students, and people with jobs where it's really easy to take a day off, hence non-critical services for most people.
You really wanna have an impact? How about a "day without a plumber?". What are plumbers, maybe 2% of the population (SWAG)? Way less than any of these other groups, but I guarantee, if plumbers could take off without getting fired for not showing up to work, you'd notice.