Just chiming in with more dissatisfaction at this (lack of) feature. This is such a waste of time - like tell me your devs don't value this feature without telling me they don't value this feature.
I literally WASTED HOURS trying to teach my last client who is basically incapable of understanding the back end of Squarespace how to add her repeating events that occur 5 times a week, every week, for the year. I sold her on Squarespace and she LOVES the calendar. Now I am basically her VA...doing it for her. FML
It's also not enough that Squarespace says "we don't monitor these forums" and washes their hands of it. Like put someone onto these forums guys and solve these issues that loyal users and builders are experiencing without tasking them to do your job for you. We are all here trying to figure it out, and you want to make us do more work to provide a case for customer service in order to tell you about your poorly designed feature? That's a no from me dawg.