A Birthdaygate Re-Opening

Do you know what November 6th is? Well; very likely the date Henry Creel got lost in the Nevada caves and transported to Dimension X, on his 8th birthday.

Do you know what March 22nd is? Likely the date that the Creel Murders happened, and Will's birthday.

But for some reason... even though these are dates previously established... the characters forgot about Will's birthday in Season Four. And then Joyce forgot Will's age upon him going missing.

And weirdest of all, even though it's established the Creels moved to Hawkins in March, the date of the play (and thus the Creel Murders) has been changed inside Henry's memory to November 6th.

Lets talk about this: