What do you get when you spend 19 hours at a Fourth of July party onboard a tugboat in NY harbor? A sunburn, welts from hurled bagels, about 12,000 calories and some incredibly good memories, Don Sutherland found. Officially it's Independence Day, but everyone calls it the Fourth of July. Its inalienable rights accrue to the common man, whose life, liberty, and pursuit of happiness necessitate keeping things simple. And is any form of theater simpler than a fireworks dispay? No plot to keep up with, no dialog to follow, just plenty of action. America feasts during many of its holidays, but with varying complication - where Thanksgiving is an elaboration of side dishes and stuffings and sauces, July Fourth is plain barbecue. Sauces? What do you call mustard and ketchup?