I rec'd this email response yesterday (09/25/16) in regards to this same question I posed to guest services:
Hi Tom,
Thank you for your interest in Universal Studios Hollywood!
If you would like to visit on a black-out day, we do offer a $29 black-out day ticket that may be purchased at any ticket booth. Please be sure to bring your pass along with you and a photo ID. If you have any questions, please let me know.
Warmest regards,
Ryan Newman
Assistant Manager - Guest Communications Universal Studios Hollywood
(818) 622-1916