I just booked a same-day hair appointment with the woman who cuts my hair, one of the women noted in DC for their skill with curly hair. I used to have to book at least 2-3 weeks in advance. My mother also booked with a few days notice recently.
I get my hair cut at Bang, where a cut and blowdry run in the $30 range, not one of the expensive Georgetown salons. If they have a lot of openings, it means that people are cutting back on getting their hair done entirely, not merely finding a less pricey place to do it. I'm told that hairdressing has long been thought of as a countercyclical good. Not any more, apparently.