I understand, it’s a really tough task speaking up when you feel you’re the voice of a minority and fear the backlash. But a day like today is also a good opportunity to address some of these things if you feel daring enough
If your workplace has done a wage equality study it will at least be available on your google drive (it should probably be public). You could take a look and if there’s anything notable and you can summon up the low impact bravery mail it to the office with the subject line ‘Happy IWD’ or ask your other non-male colleague to do it if she’s a bit more up for it. A united front can work wonders
Worth speaking to someone in HR if there’s a friendly voice there, they should have protocols and the like irrespective of their own gender.
Good luck whatever you decide 