Is this a double standard?

The  concert at Villa Maria estate was fantastic on Friday night.

It is an excellent venue by the winery and the music was outstanding. Dave Dobbyn's 'Loyal' was outstanding.

It occurred to me as the concert wound up at about 10pm, were they required to stop then as part of a duty to avoid excessive noise?

I mean this is in a rural setting. Surely there are only rural people about who should be accustomed to this sort of entertainment occurring (it was billed as part of a winery tour). What would be the harm in letting it run a bit longer? 

If a frost fan can make as much noise as a lawnmower running at the end of the bed all night, it seems to be a bit ironic to have a concert closed down at 10pm because of noise.

I might be wrong. Perhaps Dave and Anika prefer an early night?