This was a project that was similar in many ways to Hereford's Got Talent (2010). Not only did it also take place the Hereford Courtyard Theatre, but it was also a single camera project - and being single camera, it means you have to be keep as focussed as possible on the camerawork as it's basically going to be two 80 minute takes cut together in the edit.
I've done a few of these sort of demanding shooting gigs now, and they do have their limitations (you are rarely afforded the ideal position from which to film, low light, some audio issues, and you have to treat it like one big take throughout - unless you're working on a two-man-two-camera team), but despite the challenge it is always quite rewarding to do. The only thing that actually bothered me was having to compress the quality of the video to fit onto a DVD - the drop in quality isn't overtly apparent, but was necessary due to the length of the edit, which was 138 minutes!
Back to the 80s was an epic musical set in the American 1980s as performed by the Year 6 pupils of three local primary schools - Year 6 being the final year of primary school; Year 7 being the first year of high school. Like with HGT, the project allowed me to have a good play around when it came to the opening and closing titles, the central conceit being to use various fonts from 80s TV and film (e.g. Blade Runner, Back to the Future, The Terminator, and Teenage Mutant Ninja (Hero) Turtles).
All in all it was a fun (if somewhat limiting) project to do (which came to me at the last minute - on the day of, in fact) and it's a good way to strike a balance between not being overly intrusive into the performance (visually speaking), and maintaining the audible sense of audience participation that those who partook would naturally want to re-experience.