extension cord

Every year for multiple events, my school uses light fixtures (typically 2 moving heads) on a batten, we routinely run extension cords off the batten to power them, however i thought of an idea. Currently we have dead hung electrics, which could supply power to the bar, obviously it isnt the...

Is it best to plug a dimmer pack directly to the wall socket and the lights to an pro extension cord? Rather then bringing the dimmer packs to the lights via extension cord?