As someone who has close friends with people in the music festival business in Australia and NZ, I can certainly attest to it being an extremely hard market to make the type of gains that you are talking about. There are a huge amount of insurance and compliance costs that the operator is responsible for and that carries enormous risk. The business model isn't a great one, because it involves a large capital outlay of costs upfront (contractors tend to be reluctant on taking 100% risk with music events and will ask for deposits in advance), and profit is dependent on a number of factors many of which stand outside just successful marketing or high quality acts.
My friends do it for love of music- because making big money in that industry is extremely hard. I wish you well, but I would bet on the return that you are talking about being far more likely simply by holding BTC than investing in this equity.