The Ofsted report found that all areas of Doncaster's child protection services were inadequate.
The report said Doncaster could not be confident that all children known to the children and young people's services were safe.
In too many cases, professional practice was poor, management oversight ineffective and risk to children not identified or progressed.
More top news
The annual event has earned a place in the record books ahead of the grand final of the 60th anniversary show in Austria this evening.
Local authorities said the move is necessary to "avert the growing number of deaths and increasing harm linked to psychoactive substances".
Some students argued that the centuries-old tradition of wearing gowns, suits and mortarboards to exams was 'archaic' and looked elitist.