BRYAN EATON/Staff photo. Barbara Tindall's Tai Chi students move down the gymnasium at the Brown School in Newburyport, from left, Susan Gaylord, Lynn Mather, Allyson Lawless, Mike Mather, Jean Abel and Don Cornoni. World Tai Chi day is on Saturday, and the Daoist Benevolent Association will be one of three tai chi classes joining together for a morning of workshops, demonstrations and activities in Waterfront Park.

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