The 12th Annual Power to the Peaceful festival in Golden Gate Park landed on a somber day in San Francisco — the anniversary of the 9/11 terror attacks.  But here it was all about unity and three days of believing we can build a better world.  At a draw of 70,000, it is one of the largest free music, art and action events for people of all ages.  International musicians take to the stage, with the goal being to highlight our similarities and celebrate our diversity.