is change of festivals a periodic change?

Dear Student, 

Changes which occur and repeat themselves after a definite time interval are called Periodic Changes . 
Change of festivals can be periodic as well as non periodic. Festivals like Christmas are periodic changes as they repeat at a definite interval of time but festivals like Diwali can be classified as non periodic as the date of this festival changes year to year. 

Regards,

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Periodic change
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