>a seasonal outdoor concert venue and generate more income

How do you figure that? Concert ticket sales would need to be $3.5m per year to match the tax revenue. How much would a ticket to a small park concert cost, $20 tops? So we would need 175,000 attendees to break even, even if we ignore all the costs of building and maintaining a concert venue. We're not regularly filling our existing venues, and another one won't really induce more demand will it?

So a concert venue will 1.) Make the city less money, and 2.) Complete will existing arts in the city.

Doesn't sound like a good plan to me.