Both Labor Day and Fourth of July have become traditional days of celebration in the basin, with the Fourth signifying the beginning of high season and Labor Day marking the end. Lake Tahoe will celebrate its second weekend of pride and patriotism with the Labor Day Fireworks Extravaganza on Sunday at 8:30 p.m.Pyrotechnicians set up two barges, which will be located close to the shoreline on the California side of Stateline and present a show with a variety of shapes and colorful designs. The 17-minute pyrotechnic show is created by Pyro Spectaculars Inc., based in Rialto, Calif., the same company …