No, seriously. Not everyone cares. There's a good chance she really just wouldn't appreciate a celebration on a completely arbitrary date.
i seriously doubt that if he went to the trouble she wouldn't appreciate it
my girlfriend always "doesn't care" and "doesn't want" stuff when i ask her. then after i do said stuff without permission, she's all "see now this is why i love you". i don't know what sort of autistic relationship chrono is a part of, but stuffs forgeted up.