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After two days of sun-splashed revels on the riverbank and minimal carnage on the water the Head of the Charles organizers were ebullient when the 49th edition of the world’s largest rowing event came to a conclusion Sunday afternoon. “These are weekends that event planners dream about,” concluded regatta executive director Fred Schoch. “Everything has come together perfectly. I couldn’t be happier with the competition and the crowds.” The only drawback was the budget-busting security bill, which was triple last year’s in the wake of the Boston Marathon bombings, with the regatta having to bear the cost of extensive protective measures required by public safety officials.