I noticed certain people will either change the time or day (or forget the confirmed time, or that they already initially set a time and seem to randomly change to what works for them without updating others and accuse like everyone else had the wrong time) or cancel without telling others. So those people I check to see if it’s still on and reconfirm the time even up to an hour before the meet up. I usually give up on a person who does that as it’s emotionally exhausting to constantly coordinate around a changing target. I get enough of that at my job.