Milwaukee’s Summerfest ended Sunday night, after a weekend in which a swimmer on Lake Michigan apparently tried sneaking into the world’s largest music festival. Journal Sentinel photographer Mike De Sisti spotted the man, who was swimming in a lagoon from Lakeshore State Park to the Summerfest Grounds. He says a crowd at the festival noticed him, too — and when he finished his swim, security guards pulled him out and police took him into custody. Police have not said whether he was officially booked on possible charges. About 900-thousand people normally attend the eleven day Summerfest, which features hundreds of musical acts.