We were expressly told no filming.
I did zoom in on just him ( as much as was possible ) and only filmed a few short clips, not the whole event.
I felt I would have really regretted not having captured the memory, and my son loves watching himself on film, and has already enjoyed watching the clips and singing along to the songs.
And I just don't see how a video of fully clothed children would be satisfying viewing for a peadophile. With this vein of thought surely we should start making our children wear burkas.