Any of the 7 people listed here: https://en.wikipedia.org/wiki/LK-99

It must be about physics. It cannot be an apology or examination of past failures; they must be presenting their own new research positively, and have been selected due to the merit of the research, not as an example of failure or other similar fallout from LK-99's failure. Obviously, if LK-99 turns out to be true, then speaking out about it will be frequent and common, and this will YES easily.

The conference must be attended by at least 100 researchers in the field of physics, and must be about physics. It should be a "mainstream" conference. Hard to define, but basically, one which say at least 20% of active physics professors do not dismiss as pseudoscience.