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From the introduction:
Brave the challenges of The Lost Temples of Lake Luo with five stalwart companions in a race against time as you face vile monsters, diabolic puzzles, and inscrutable NPCs. This event will space nearly 8 hours of continuous play. Bring your existing Adventurers League character of up to 10th level or create a new one at 1st level. The D&D Open is open to all challengers.
Play of this open requires at least fourteen (!) tables. The open premiered at Origins 2017.