I hate making too many arrangements well ahead of time for various reasons.
1: I hate having to cancel stuff even more.
we have lots of kids so the potential for someone getting ill or injured is greater than say in a 4-person family.
I've lost count how many times we had to cancel or reschedule stuff because of that.
I'd rather just wait and see if everyone is ok and we can go.
2: I often don't want to commit to anything if I don't absolutely have to (I'm not going into reasons why).
3: I have had people cancel or alter plans far too many times, because they had something better come up, so I just don't trust them anymore to keep their word.
4: my periods are horrendous. they are fairly regular but can easily be off by a week over a 3m period so no, I'm not planning a day out for when I could potentially be bed bound. let's just wait and see nearer the time
5: I like and need to do things spontaneously. (it's a complex issue for me so again, not going into it)
the list goes on but those are usually the main reasons.
Of course I will commit in advance to bigger occasions like a wedding or a birthday party (especially if we are hosting) or who & when are coming for Christmas etc and any kind of doctor's appointments or kids' school related things.
But that's enough.
Hope this helps to understanding - well, if you are intending to understand, not just having a rant🤣