thank you for this thread, but question for the NBME:
Isn't having exams cancelled with less than 48hrs notice also disruptive & unprofessional "during the registration, scheduling, or examination process?" https://twitter.com/jbcarmody/status/1260306251310870533

The NBME should ensure that they and their testing partners have to play by the same rules as us.

(I know this thread was about CS, but the rules for irregular behavior apply to all exams)