Dance The Threshing Floor www.thethreshingfloor.net (503) 901-3701 The Antonia Ballroom has partnered with Holly Fidanzo of The Treshing Floor for your very own private dance lessons. The ballroom is exclusively yours for the course of your lesson. She offers swing, rumba, waltz, foxtrot, cha cha, tango, west coast swing, wedding dances and more!