BOSTON--All entertainment was banned from Boston night sports as investigators sought tonight to place the blame for the Cocoanut Grove holocaust and to prevent a recurrence of the disaster that claimed at least 460 lives.

The Boston Public Safety Committee announced the revised official death list of 460 after a day during which the toll had jockeyed between 449 and 492 because of duplications and because of additions furnished by the U. S. Army and Navy.

Only five victims remained unidentified in morgues and a hospital check showed 172 still under treatment, with a score in critical condition.

Action by the Boston Licensing Board in suspending the entertainment licenses of 682 restaurants--including night clubs--293, taverns and 35 hotels followed a warning from Gov. Leverett Saltonstall. He told the board that it would be acting on its own responsibility if it permitted such establishments to continue to operate on a normal basis pending a re-inspection of fire hazards. The Governor advised the Board to act first and check later as to whether it had the necessary authority.

Meanwhile, a board of inquiry, headed by Fire Commissioner William A. Reilly strove to establish whether the holocaust involved criminal negligence, and if so, who were responsible for the fire trap.

Executive Secretary John J. Kearney of the Bartenders and Waiters Union testified that the night club patron blamed indirectly for the holocaust was a sailor who unscrewed a light bulb to darkon a corner so he could "mug" his girl friend.