I guess the event was the Coronation. But no idea how that helps with the sentence.
I think there was a sentence that helped British schoolchildren remember the names of the Kings and Queens ...
but I could never remember it.
Also the names of the wives (6) of Henry VIII ... but again, I have happily forgotten it.
Of course, I could be totally wrong.
“The honest man, tho' e'er sae poor,
Is king o' men for a' that” Robert Burns