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In page Carnival:

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Masks are worn to many of the festivities, including concerts and parties. Children and teachers are commonly allowed to wear masks to school for a day, and also wear masks at school dances or while trick-or-treating. Carnivals also take place in summer. One of the most famous is the Senj Summer Carnival – first celebrated in 1968. The towns of Cres, Pag, Novi Vinodolski, and Fužine also organise Summer Carnivals.[citation needed]