Bay seniors looking for an alternative to shopping malls should check out the Jack of All Trades Market which is held every second Saturday (that means this Saturday the 9th) at ever-hipper Jack London Square from 11-5. You never know what you might find in the stalls of antiques, vintage jewelry and clothing, crafts, art and the inventions that these days are called “makers”. Live music. Dogs welcome. Food trucks and craft beer. And unlike many flea markets, no admission fee. Win yourself a $100 spending spree. The Geezer will be looking for a good pair of suspenders.