Department of Justice, Home Affairs and Migration

I wish to request records relating to the following: Why the invitations to attend the naturalisation ceremony were sent by emails, while it is stated on the website that invitations will be sent by post? How many invitations were sent to participants and how many actually attended/turned up to the ceremony? Why the date of the ceremony on 10 March 2023 was not published on the website and what is the reason for conducting this unannounced ceremony?