DANCE

The 50th anniversary of American Ballet Theatre (founded in 1940) will be celebrated with an 18-month season and a number of special events, artistic director Mikhail Baryshnikov said Wednesday in New York. The plans include a retrospective of company repertory along with extended U.S. and international touring, a traveling exhibition of company memorabilia, a new PBS “Dance in America” telecast and a gala performance in New York next January. The company also has a new logo: a fuzzy blue ballerina trailing red and white veils. Philip Morris Companies Inc. is sponsoring the celebration and national tour with a grant of $750,000.