The bright side of Final Fantasy XI having been around for a while is that the lack of new seasonal events is easier to overlook. You don’t need new ones; you need another round of the familiar ones to pick up rewards you might have missed. So while you can imagine that the Celestial Nights celebration will be more or less the same as it was last year, that means you have a new shot at cosmetic items from the Far East and the general fun of the event. That’s not so bad.
For those who haven’t done the event before, you can take a look at last year’s guide (which itself was more or less the same as the year before); the fundamental mechanics are an escort quest to bring two NPCs together, as the MHMU has turned the festival into a fiasco the same as every other time. Help your escorted targets reach their destinations, pick up your gear, and enjoy another year of the celebration.