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Be sure to come back to the Anniversary garden often - Once per day you can click on any of the Banquet Tables to receive an additional 5% XP buff that lasts for 24 hours in the 15th Anniversary party area! Be sure to use the suitably placed bank chest in the party area to make the most of this training boost.
Guess those drinks from the beach event wasn't easy enough to access to make the area relevant for Jagex' desired duration so they had to make it easier this time :v