What is live entertainment? The question might be simple, but when it comes to Nevada tax law, the answer is mind-numbing.That’s what members of the Assembly and Senate tax committees found out Thursday when they were briefed on the revenue source that is projected to bring in about $282 million in the next biennium.Take outdoor concerts, for example.Whether they are subject to the tax depends on where they are held and other factors, such as whether admissions go entirely to a nonprofit group.Outdoor concerts per se are exempt — unless they are held on casino properties. Then the tax, calculated …