Dance has sales about every two months or so at the MD State Fairgrounds. They have everything from box lots of household stuff and low end furniture to some very high end furniture, jewelry, art, antiques, etc. They also sometimes get the contents of storage containers which they usually don't even sort, and sometimes there are hidden treasures in those.
You do have to be careful about phantom bids and other little tricks, though. Some of their auctioneers are honest but not all. This is typical in this business, unfortunately.