Mesta Park in NW OKC. The park is the center of beautiful historic housing district with lots of gorgeous Victorian homes. I took plenty of pictures of those, too, for other days. But just as a teaser, here's one of them. I was very taken by the sharp, Gothic/modern black and white paint job.
Edmond Arts Festival or the Norman Arts Festival. If those are still too nerdy for you, I'm sure you can find anything you like on the Gazette events list.