That’s just
Madness, honestly
BORK!BORK!BORK! An update message made an unscheduled appearance on a big screen during July's On The Beach event in Brighton, England. Partially obscured by speakers capable of deafening those at the back of the audience, the pop-up still managed to compete with the performers for attention. Thanks to modern technology, …
From the article - 'What do you do? Do you allow the update to proceed? Do you close the message and hope it won't reappear at an inopportune moment? And if you do something, do you risk interfering with a carefully choreographed show?'
Use a proper, industrial strength OS in the first place - not one that you don't control. (Is it a Mac?)