This weekend is a corneal extravaganza with three art fairs competing for your eyeballs. At Fort Mason: “FogFair” runs from Jan 11-14 starring 45 galleries including blue chip dealers like Bergruenn, Gagosian, Pace and Marian Goodman as well as more affordable crafts, furniture and housewares. $25.At the Palace of Fine Arts is “Untitled” with works from major players like David Zwirner and institutions like the Berkeley Art Museum, plus performances and “conversations”(lectures). $26. The newcomer is the East Cut Art Fair a popup at 160 Spear Street on Jan 13 and 14, curated by four local galleries with more reasonable prices. Free.