You can undertake this quest at any time but complete it only during your in-game birthday.
This quest [3347] is called 'Birthday Party Tutorial', for Adventurers levels 10 to 241. This is a TUTORIAL. It provides no rewards, but teaches you about Alyria. It's time to celebrate your birthday with a kindly grandpa. Tutorial quests do not grant rewards. This quest has no time limit. Birthday Party Tutorial consists of: Phase 1: Journey to Junction of Finkerstam Road and Gashok Road [Lowangen]. Phase 2: Journey to Gashok Road [Lowangen]. Phase 3: Journey to Dargon Walk [Lowangen]. Phase 4: Journey to Dargon Walk [Lowangen]. Phase 5: Visit Reencaul the Sage [Lowangen]. Phase 6: If today is your Alyrian birthday (check SCORE), receive presents for your birthday from grandpa.