It appears there was an error in the Calendar, we noticed a weirdness in the dates. Kaos commented this on the French discord. Thought people should know ASAP (Jessie isn't currently online on Discord and @Chthugha didn't respond to a ping)
Google Translated:
@ Kaos-Kinkoid @DragonFire Kinkoid on the note patch, the legendary event is scored started on the 26th at 5am, and on the schedule on the 27th. Quid?
Kaos-Kinkoid - Today at 22:14 calendar error
Makuro 💸