Rearranging the letters of 'The tenth anniversary' gives:
That's never ninth year!
(by Aronas Pinchas ) (2014) (pending approval)
Other related anagrams without their own page:
"Tenth anniversary of Princess Diana s death" -> "A natty car and safe Henri s driven on the piss." (by Mick Tully using Anagram Genius) (2007) (pending approval)
"The Diana Princess of Wales Memorial Fountain" -> "Lifts as a fine showpiece? Or a monumental drain?" (by Tony Crafter using Anagram Genius) (2004)
"Princess Diana,Candle in the Wind" -> "Accident in Paris handled in news." (by Judy Miller using Anagram Genius) (2006) (pending approval)
"Princess Diana,Candle in the Wind" -> "And hence wild antic ends in Paris." (by Judy Miller using Anagram Genius) (2006) (pending approval)
"Princess Diana,Candle in the Wind" -> "Was Di enticed in crash in end plan?" (by Judy Miller using Anagram Genius) (2006) (pending approval)
"The Diana Princess of Wales Memorial Fountain in Hyde Park" -> "Form "an anachronism", like an open filthy sewer. A stupid idea." (by David Bourke using Anagram Genius) (2004)
"The Diana Princess of Wales Memorial Fountain in Hyde Park" -> "I am a puny and effeminate inane; crash kills poor Di. Worst, eh?" (by Chris by hand) (2006) (pending approval)