The video of the Lakeside Golf Course was shot this summer using a drone. It gives you a really good look at the site and how big it actually is.
If you look at the 3:00 min mark you can see the site of the the concert area (hole number #4). As you can see, the hole is orientated toward the south-west. The stage would be located on the lower part of the hill and the sound would travel up the hill. That site is also surrounded by thick forest which will also reduce sound from carrying beyond the site.
The producers will be utilizing sound delay speaker systems along the concert area so the music doesn't come from one source (the front) and have to be turned up for the people in the back to hear. It's like surround sound in your house.