I don't like meaningless music festivals where people earn money, so I would like to create a charity festival where aspiring musicians can perform.
At this festival, everyone would have performed voluntarily, and all the money raised would have gone to the treatment of children with cancer.
I think this festival could be held in the park in the summer and, in addition to music, organize various interesting contests or needlework workshops.
A possible environmental problem could be a large amount of garbage, but as a solution, I would place several ads asking you to sort the garbage into appropriate bins.