My singular experience is from last year. In two separate lakes, both a little less than 300 acres, I found large concentrations of bluegill on a bed in both the July and August full moon phases. I don't think all beds are active after May, as I've never really had action on many of my favorite bedding areas after May before, but I did find a couple of very active beds last summer. Don't know if the unusually cold and long winter and the relatively mild summer contributed, or if it is an annual occurance.