DAVID L. RYAN/GLOBE STAFF

As only they can, Blue Man Group entertained a crowd gathered at the Boston Children’s Museum Wednesday to kick off the museum’s 100th birthday celebration. Flanked by a few familiar faces — former Celtic Walter McCarty and Olympic judo gold medalist Kayla Harrison were in the house — museum CEO Carole Charnow announced a year’s worth of programs and events to mark the centennial.

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