Vaisakha

Vaisakha Purnima is celebrated as Buddha Purnima or the birthday of Gautama Buddha amongst Buddhists of South and Southeast Asia, Tibet and Mongolia. Purnima refers to the Full Moon. Known in Sinhalese as Vesak, it is observed in the full moon of May.

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Vaishakha Purnima is known as "vaikasi vishakam" in Tamil Nadu which is celebrated as the birthday of Lord Murugan.

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Source
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