Dear 7:30 Saturday migration walk participants, Due to the Brooklyn Half Marathon this Saturday, May 16th, the walk will meet at Duck Island just inside the main loop of Prospect Park. This is the island we check first thing each week before we head along the south shore of the lake. I suggest getting there early--by 7:15 the latest so that you are able to enter and meet the group in a timely fashion. We will continue along the south…