This event was part of a few days of anti war activities sponsored by Veterans for Peace.
From the website- http://www.vfpgoldenruleproject.org:
The original peace ship, the Golden Rule, that set sail in 1958 to stop nuclear testing in the atmosphere, inspired many of the subsequent peace makers and peace ships that followed. The reborn Golden Rule is voyaging once more, to show that nuclear abolition is possible, and that bravery and tenacity can overcome militarism.
From early June through September, the ship will be plying the waterways of the Great Northwest, making stops in over 30 ports as she continues her mission to sail for a nuclear free world and a peaceful, sustainable future. The Golden Rule and her crew will also spread the word about the continuing dangers of nuclear power, and the poisoning of the air, water and soil from the entire nuclear cycle, from uranium mining to the disposal of nuclear waste.
The event at this time featured speakers on these issues and others, all with the music of David Rovics.