North Star House in Grass Valley, a 1905 Julia Morgan-designed home currently undergoing rehabilitation, will hold its first North Star House Festival from 10 a.m. to 3 p.m. Saturday, June 4. The free outdoor event marks the official transition of the site from rescue project to community-use venue. The festival is themed "Race Day at the House" and commemorates the 100th anniversary of a historic automobile race to Tahoe over primitive roads and deep snow. The 14-acre site surrounding the North Star House has undergone extensive improvements in the last year and now features a Great Lawn and several distinct …