The bigger question is if a golf course the best use of City lands when such a small percentage of people play golf.  If 40k people show up the festival that's probably more individuals than will play golf at that course all summer.  Why should all city residents subsidize the hobby of a few?  In an urban environment the city should be trying to maximize the the use and efficiency of City owned lands and parks.  I'm not sure a golf course is the best use.  That's a lot of land that only about 70 people can be using at any given time.

PS, I say this as someone who plays golf