Yes, I've already been to Trabia garden and tried to approach from the shore or from the other directions but nothing happen. At first i thought it was because my LV was too low (i collected monsters into card.) At that time Squall LV was at 17 but when the event didnt occur so i kept fighting monsters till Squall LV is 30 but it didnt work either.
Guess i have to let it go (after 60 hours of running around the world ) if it is the problem with the game.