From https://www.berksmontnews.com/news/...R0t90XApc-WxLbCUXskgjc9_y5SbnjIDzcLhk-m95ftcg :
I suspect LED poisoning. Or new take on "death by FEL." Carbon-arcs in the flies?
“After hours of testing, they did not find any cause for the illness, or any unsafe gas levels, including but not limited to carbon monoxide. One concern that has been identified is the possibility that the stage lights could have been a contributing factor to the illness. Therefore, the overhead stage lights will not be used until our lighting contractor can certify that they are safe and working properly,” reported Miller.
I suspect LED poisoning. Or new take on "death by FEL." Carbon-arcs in the flies?