Drums pounded as members of Danza Xitlalli, an Aztec dance group, circled the lawn of the Oakland Museum of California on Sunday, turning counterclockwise, then clockwise, to open the museum’s annual Día de los Muertos celebration. As the crowd swayed with the dancers, heads tilting as they turned, feet tapping the ground, others put the final touches to their altars, placing candles, marigolds and bundles of sage with the photos of their loved ones and their favorite things. Día de…