Generally speaking, in trade conferences like this one where Foundation Establishment Cultivators gather, Crystallization Cultivators usually wouldn't participate; even if they did, it would be very rare.
What kind of treasures could a Foundation Establishment Cultivator offer that would tempt a Crystallization Cultivator?
They aren't even on the same level.
However, this time's trade conference on Hidden Mist Island is organized by the Hidden Mist Island Commerce Association. Not to mention Crystallization Cultivators, there's even a Golden Core Ancestor present on the scene.
This Golden Core Ancestor, named Li Xuansheng, is a veteran of the Hidden Mist Island Commerce Association, here to oversee the trade conference, ensuring it proceeds fairly, justly, and safely.
After all, on Hidden Mist Island, the existence of the Seven Great Markets not only attracts cultivators from all over the Celestial South but also draws numerous evil and demon cultivators to tread upon it.