Maybe Mayor Adrian Fenty and Vince Gray both had good days, or maybe both recognized that last week’s Ward 4 mayoral cage match got a little too heated and negative. Whatever the reasons, both Gray and Fenty largely steered clear of each other at last night’s Ward 8 forum, held in an auditorium on the St. Elizabeth’s campus. In fact, the whole event was basically structured to be what Ward 4 wasn’t — well-moderated, insightful and of actual use to the undecided voter.