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Mark Wahlberg made a surprise appearance at a pep rally for the Boston Scholar Athletes program at Agganis Arena Tuesday. The Dorchester-bred actor was met with exuberant applause as he walked out in a BSA jacket — with his name on it, no less — to shake hands with Suffolk Construction CEO John Fish, the chairman of the event, as well as Mayor Tom Menino. Always a lively time, the pep rally was especially spirited in the aftermath of the Marathon bombings, as several hundred Boston Scholar Athletes joined business and civic leaders in cheering their support for Boston. The BSA program, created in 2009, seeks to improve academic achievement through athletics in the Boston public high schools.