Western Weekend, West Marin’s 76-year-old salute to its ranching roots, is nigh. Leading this year’s June 8 parade is grand marshal Bob Giacomini, the 87-year-old dairyman who transformed his family’s 700-acre dairy farm overlooking Tomales Bay into the now-famed Point Reyes Farmstead Cheese Company. He was nominated by his daughter Jill Giacomini-Basch and selected by the West Marin Lions Club from a pool of nine contenders. The junior grand marshal, David Rodriguez, grew up on…