Because of the 80/35 Music Festival, scheduled July 10-11, several downtown streets near Western Gateway Park will close this weekend, a majority of which close today and reopen Monday morning. Among the street closures are 12th Street from Locust Street to Grand Avenue, which closed midnight Tuesday and will reopens 5 a.m. Monday. The following streets will close effective 6 p.m. Thursday and will reopen at 5 a.m. Monday: Locust Street from 10th to 15th streets; Grand Avenue from 10th to 14th streets; 13th Street from Grand Avenue to Walnut Street; 12th Street from Locust to Walnut streets; and 10th Street from Locust to Walnut streets.