St. Tammany Parish: Slidell Heritage Fest, Heritage Park, fireworks: Saturday, June 28, from 5 p.m. to 10 p.m. Sparks in the Park, Bogue Falaya Wayside Park: Saturday, June 28, 5:30 to 9:30 p.m. Light Up the Lake Independence Day Celebration, Mandeville Lakefront, Mandeville: Friday, July 4, 3 p.m. Pearl River Fourth of July Celebration, Downtown Pearl River & Town Hall: Thursday, July 3, to-9 p.m. Madisonville Old Fashioned Fourth of July Celebration, Tchefuncte Riverfront and Town Hall: Friday, July 4, 10 a.m. to dusk. Olde Towne Slidell Fourth of July Celebration, Carey, Cousin and Robert Streets: Friday, July 4, 4…