I guess I wasn't clear, I work on the east coast of the US but having EU employees means people are used to some of their coworkers not being available all the time.
The team there was shocked and maybe offended even, and I was informed it was verboten to work any of the next 3 days.
Differences in work cultures globally are staggering.
Everywhere I've lived and worked (only two countries, tbf), the idea of working on a holiday weekend is just ... not considered, outside of being on call and getting paid extra for it or similar.
In my experience it really depends on the individual, team, and company just how strict people are with not working unscheduled overtime on national holidays to crunch a release or not.
But assuming that it will happen, that's a first for me.