Works maybe for small concerts but I doubt it’s viable if you have to factor in the wages of the organizers, promoters, stage crew etc.
Discussion
Yes, is not easy to organize a concert.
Also is not necessary to be a giant scene.
Concerts will be crowdfunded before will start.
Let's say a band will announce a concert in x place and the budget they will need to cover for all the logistics.
Fans will see how much it costs and they start funding directly the whole concert.