I think it would be nice to be able to specify opening hours for specific groups of people, just like for it is possible for different parts/services within an establishment (such as opening_hours:kitchen for restaurants). A hospital could have opening_hours:patients (if not 24/7) and opening_hours:visitors, a bathhouse could have opening_hours:men and opening_hours:women, a swimming pool could have opening_hours:lessons, opening_hours:families, opening_hours:60+…