Last night the Dark Star Orchestra performed the first of three shows at the Fillmore Auditiorium in San Francisco. Thursday’s gig, which also served as a Rex Foundation benefit, featured some familiar guest players. Bob Weir emerged early the first set and remained through the close, adding guitar and vocals to such songs as ‘Jack Straw,’ ‘The Other One’ and ‘Hell in a Bucket.’ Then, during the second set, one-time Grateful Dead collaborator Martin Fierro (who also appeared with Jerry Garcia in Legion of Mary), added sax to a portion of the second set which included a strong take on ‘Weather Report Suite.’ The Dark Star Orchestra returns to the Fillmore tonight and Saturday.