Bay seniors drawn to the power and authenticity of ethnic arts can indulge themselves all weekend at the Tribal and Textile Arts Fair in the Fort Mason Center, More than 80 high-end galleries are displaying sculptures, masks, ceramics, weapons and jewelry from almost everywhere – Native American, Latin American, African, Asian and Oceanic. Most are historic but a few such as Vichai Chinali’s zen brush paintings are contemporary. $15 includes catalog. For another heavy dose of native crafts visit the Marin Art of the Americas Show Feb 20-22 at their Civic Center. It includes a special exhibit of California basketry. $15.