I realize this has been up for a while but I did want to chime in. I did see the the Rod Evans bogus DP in El Paso TX. One of 5 dates in Texas before they got served with their cease and desist. They actually announced on KLAQ that it wasn't Blackmore, Gillan, Lord, Paice, and Glover a couple of days before the gig but the place was still full.
Ersatz Purp was actually better than I expected. They did put some effort into it. The Jon Lord impersonator had a Hammond set up to rock back and forth. You could tell though from the way it was set up in a balroom with less than professional lighting that it was "d" circuit grade stuff.
What I remember more than "BSDP" was the opening act "Facelift" who sounded like a King Crimson/Gentle Giant hybrid. I have not seen nor heard of them before of since that show. Anyway soon after they got sued and had to stop the tour.
That's my recollection of it. If anyone knows what happened to Facelift I'd be curious.
Ben Zuda