Paedophile Neil Wilson, who received a suspended sentence after his 13-year-old victim was called "predatory", has been ordered to serve an immediate two-year jail sentence by Court of Appeal judges.
They ruled that his non-custodial punishment was "unduly lenient".
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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.