I have done 2 for my 2 boys, Ashtons will be in March.

We booked a celebrant who just read a couple of poems and introduced Ashton to the guests etc, and presented him with a Naming Ceremony certificate that us and the boys godparents signed. Only went for about 15 mins the actually ceremony part, but we did it mainly so the kids could have "godparents" and we are not religious so didn't want a christening etc

Love