SPECIAL PREMIERE: With Portlandia in its final season, former Saturday Night Live regular Fred Armisen is about to be a free-range chicken again, roaming among various projects. And why not start with this one? After all, it does something neither Portlandia nor SNL allowed the chameleonic comic to do: to stand on stage, without hiding behind wigs and costumes and characters, to make observations and jokes, and be funny on his own terms, as himself. And behind his own drum kit, which, for a standup comic, is eminently and dually practical: You don’t have to stand up, and after jokes, you can provide your own rim shots. Ta-dum-BUMP!