A reunion concert is, in principle, an once in a lifetime event. Consequently, no risks could be taken regarding video, sound and pictures. The first two had to be tackled by experienced engineers of the host venue. No problems to be expected in this area.
For the same reason, however, it was desirable to look for an experienced photographer. I was fortunate to have met Marc van Beelen, in a totally different setting, some time ago.
A few examples proofing his talent and skills can be found in the 'pictures' section (left on home page) or here.

He's much more then a great concert photographer. Have a glance at his website. It’s in Dutch, true, but it still worth to spend some time there. Sneak in here.