Most circus events are pricey. But this Sunday, the circus is coming to the park for a free show. There will be no animals or big tops, just pure acrobatic arts. Watch athletes fly through the air on the trapeze, twist and turn on hanging silk, and spin on a lyra. These feats of strength, beauty, and daring will be performed on Powderhorn’s grassy lawn. Bring a blanket, some picnic supplies, and be entertained.