Every year Psychology of Vision trainers are required to pay a very steep "license" fee and are required attend the annual trainers' training in Hawaii, which lasts for over a week in early January.
(For more details, read the Psychology of Vision trainers manual: http://psychologyofvision.blogspot.in/2015/09/psychology-of-vision-trainers-manual.html )
Here is a very interesting photo taken in the first days of the 2016 training: