Holy shit... I think I just stumbled onto the "holy grail" of Rocky Horror videos. In relation to pic 4 in Brad's post
here, I had an idea of what cast it came from and coincidentally found a 37-minute video of the performance that photo was taken from. It almost certainly comes from the same cast performing outdoors whose photos appear
earlier in this thread.
Unfortunately the video's on vimeo, and I don't want to run afoul of the rules by posting it here, so I'll check back here to see if a mod gives me a response.
Meantime, I've saved the link myself. If anyone wants it (NOTHING is hidden), PM. Or if you want to try to locate it yourself, the cast is called In The Flesh. Happy hunting!