No you can't and if you did that was an exception on your cruise. The Crown Lounge (old Diamond Lounge) is only for Diamond, Diamond+ and Pinnacle. We have seen the CL (DL) concierge check Seapass cards and deny those that were not D,D+ or P. As it should be! You are allowed to give your CAS drinks to whoever you want, at any other bar/lounge.