O'Farrell's is phasing out, I think---but they are still having sales. They do box lots of fairly junky stuff (some hidden treasures) in the barn in the morning. THere is no AC or heat in the winter so dress accordingly. Bidders tend to move things from box to box so be sure to check what's there just before a box is sold.
The main building has the nicer stuff and furniture, with toys, sports stuff, dolls and other collectibles in the back rooms. There are usually two auctioneers going at once and they stick to an order of sale pretty well. They seem to be pretty honest though I've heard that they let consignors bid on their own items (illegal).
Food is iffy. Parking is good.