It's held at Mitchell Park, which has limited parking (Esp. after all the cooker get there early.). Many visitors than park in the neighborhoods around the park.
What is the alternative transportation choice?
Don't look for the city's shuttle, who's regular route is right by the park. It is shut down for the holiday.
But, hasn't the cityh done special runs on weekends for the big doin's downtown - the art wine thing that bolsters business, have bunches of parking, and bring sales tax - and benefits tourists more than locals?