In this country, the Scouts dropped "boy" in 1967 and they've been allowed to be mixed since 1976 or 1991 (depending on age). All groups have been mixed since 2007. Guides are still girl-only.
Hopefully we'll see more gender-neutral toilets over the coming years. There are still places where the gender balance is such that it doesn't make sense to have gender-neutral toilets. One solution could be to separate urinals from cubicles.
We should abolish Mother's Day and Father's Day rather than merging them. Merging would be my second choice. The status quo a distant third. Same with prisons.