You could get a group of residents to write a congratulatory letter to HRH.
Her Majesty can be reached at the following address:
Her Majesty The Queen
London SW1A 1AA
It’s ettiquete to open with ‘Madam’.
You close the letter with ‘I have the honour to be, Madam, Your Majesty’s humble and obedient servant’.
Find more info here:
Alternatively, you can send her a message online here: