It’s a daily repeatable during the eventNo answer to my question above ? About this : "After finishing the questline in every 24 hours, until the event ends, you will be able to finish a quest to craft Birthday drink:"
It's written in the presentation thread of this event. From how I understand this, that's supposed to mean we have to play the questline everyday to have access to the final quest. But I'm not sure to understand this correctly, especially knowing IG that's not written. From tw-calc, seems like we only have to play the questline once, with at the end : the quest allowing to win the Birthday drink; and after this we can play this last quest again every day until the event end.
That would seem more legit but that's not what's written in the presentation thread. And tw-calc wrote itself that some information may be incorrect so in the end I don't know what to believe lol.