How Should I Dress for this Shindig?

We’re calling it “Cocktail Casual”, somewhere in between Dressy Casual and Cocktail Attire. The entire wedding is indoors, and air-conditioned, so no need to plan for rain or too much sweating (until you boogie with us in the Dance portion of the evening). Look Pretty! Look Handsome! In other words, have some fun, but don’t stress or spend a bunch of cash on a new pair of shoes.