We don't know much else about the event just yet, but it would appear to be some kind of community event in which players investigate rumors and search for missing treasure.
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Secrets of Azeroth – New In-Game Event Awards Mount, Pet, & Title
A new in-game event has appeared on the Dragonflight Patch 10.1.5 PTR. Between August 30th and September 13th, players will assist the Preservationists to discover clues and rare treasures to unravel the Secrets of Azeroth!