According to what we saw in 20th March GTG .. the "mauseeqar" cars were lined up in the middle of other cars ....
First each car was given time to perform ... everybody gathered around one car at a time .. and then moved to another.
When all cars were completed, then it was up to the individuals whether they liked to play songs .. In case of Laadli, she entertained the members for several hours ... I did not know the impact, but that caused substantial drain on the battery and as the evening fell, I could see the yellow headlights but it was enough to crank the engine.
In next GTG, I will keep the engine running for as long as it goes. The new set up cannot be used without the engine running