It never fails to amaze me what some of these yoyo's get up to & thier electrix. They cobviously cobbled the fuses & /or Mains Breakers, in order to overload the current rate of the mains conductors. I guess the techie got his electrical licence out of a Wheet Bix packet.
I predict they won't need to upgrade the mains curent capacity & the wiring any time soon, after the venue burns down.
I came across something similar, at a Regional Venue a few years ago. They rigged up a heap of parcans on the stage, as lighting for a about a 10 table cafe set up. This was for thier annual centre open weekend celagration event, where they invite the public to view the centre & run a type of community fair ther.
The head Tech had these parcans working thru the dimmers for about 15 hours per day. He believed having the dimmers running them on about 50%, that he could twice the amount of lights on one dimmer rack.
So realising the pack was starting to over heat & smoking a bit, he did the same CO2 quick fix. Even set up a number of portable fans in the patch bay, to keep the racks cool.
He was amazed when the dimmer racks sprung a major leak & all the smoke came pouring out of the dimmer packs & the 3 phase mains cables, started to burn back & leak smoke in the same manner.
Before he apparently used up the 4th CO2 extinguisher, The trusty Fire Brigade arrived to finish the dimmer racks off completely,
It wasn't his fault, because it must have been a fault with the dimmers that caused it!
Not being qualified or under standing the principles of Ohms Law, he was at a complete disadvantaged, in understanding that the dimmers are designed for short & variable duty. Not continuios at 50% of it's load capacity, which creates overheating & smoke starts a leaking.
If he had have been a licenced electrician, he would have understood the principle theory of Spectral Manifestation Of Known Emf [volts] or
S.M.O.KE. for short.
Electricity is just that, it is generated with smoke
This was proved out by 'Bell Labs & can be checked easily when smoke is leaking out of equipment, it will eventualy run out of smoke - thus the equipment stops working!
Further Q&A can be found in articles on this site, which will help with understanding this theory;-
http://www.peizhang.com/forfun/forfun_writings_smoke.htm