This looks like a great idea--a Flash Mob. It lasts exactly 15 minutes. There are over 80 of them happening in 9 countries that day. Look on the events calender for May 10.
All we need is a reasonable size park. No special set up except a bucket for logs. Read any of the event sheets for that day. They are all similar. Some have event cache set up, some do group photos. Trying to find background info but it's getting take. Will check out further tomorrow. There's none in NYC area.
Let's do it! any volunteers? How about one in Nassau or Brooklyn?
J