Bonnie Guttman is stepping down as director of the Dance Palace after a seven-year tenure during which she helped the community arts center stabilize its finances, navigate the pandemic and refocus its mission. Steven Siegel, the former C.E.O. of the Coastal Health Alliance, will serve as interim director while the board searches for a permanent replacement. “Bonnie is interested in exploring some other career opportunities,” said Barbara Jay, the nonprofit’s board president. “Seven years is…