I wouldn't say they're as useless as toilet paper, cause, well...I don't want to be caught without toilet paper. But yes, I agree, crowd calendars are utterly silly IMO. There's a reason, IMO, that you see so many people say "Why do they conflict?" or "Why are they changing?". The answer, IMO, is because they're just wild guesses. Due to so many uncontrollable and unforeseeable variables there is no way that they can have any true statistical accuracy. You can look at the 3rd week in May over the past 10 years, but outside of a very general sense, it doesn't mean anything for what will happen the 3rd week of May 2018 or 2019. There are some very broad generalizations you can make...Christmas is busy, Spring Break is busy, etc...but to get specific and say Park A on a Tuesday will have a crowd level of "x" makes no sense to me.