Antiques Roadshow fans, this one's for you: The show's rotating cast of appraisers includes staff members from New England's best-known auction house. Skinner mounts about 60 auctions a year in Boston (usually on weekends) and suburban Bolton. Visitors can bid or observe. You might see fine art, antiques, collectibles, jewelry, furniture, ceramics, textiles, rugs, or even musical instruments....