What's the difference between a normal tourdate and swanfest?

In a lot of ticket sites and on the dgd site "swanfest" seems to be separate from the return of the robot tour but I can't seem to find anything that differentiates it? I've never been but is swanfest yearly despite if they're touring or not, and then if they are touring it's just wrapped in?

I'm in the middle of a four hour drive to either Chicago and Tennessee and I decided on Tennessee simply due to the climate and drive but if I'm missing out on a bunch of stuff because Tennessee is a normal tour date whereas Chicago is "swanfest" I might charge my mind but I can't seem to find anything online (because I am stupid)