Jonathan Legris, 26, the stepson of nurse Rui Li who was discovered dead in the boot of a car in Bournemouth, has been charged with assisting an offender after Ms Li's husband Pierre Legris was charged with her murder, Dorset Police said.
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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.