Just make sure not to take it too far if you do proportional voting. We have a system in the Netherlands that works like that but the result is that we now also have about 30 parties running for government, most of them being fairly pointless. Don’t get me wrong, it’s better than the US shenanigans but you can also go too far.
I suspect women’s day (just like mother’s day and father’s day) led to a spike in sales at business, meaning they embraced it with marketing and special deals.
Men’s day is a bit different because like you said, it’s not as well known, and also men generally resort to buying gifts more often than most women do for men.