Got my naturalisation approval letter

[LondonStrawberry]

Hi,
I am so thankful to admins, moderators, and members of this forum who always helped me during my all visa, ILR and naturalisation processes.
Last Saturday I received my approval letter of naturalisation from HO. Letter dated: 26 march 2016.
This monday on 4th april 2016 I contacted my council to book my ceremony, which would b on the last day of this month because they did not have any place before that.
Approval letter stated that I have to contact my council for ceremony arrangements within 21 days of this letter. (I already have booked the ceremony)
My question is that Does this statement mean that I only have to book my ceremony within 21 days of the approval letter or I also have to attend ceremony within these 21 days to receive my certificate?
Can someone please guide?

Kind Regards,
AS

[CR001]

You have to BOOK your ceremony within 21 days. You have to ATTEND your ceremony within 90 days of the approval letter.

[LondonStrawberry]

You have to BOOK your ceremony within 21 days. You have to ATTEND your ceremony within 90 days of the approval letter.

Thank you so much for clearing my confusion.

Regards,
AS