Vaigaasi Visaagam marks the birth anniversary of Lord Murugan. It is celebrated in the Tamil month of Vaigaasi (May to June) when the Visaaga natchathiram (star) coincides with the full moon.
Lord Murugan and the Visaaga Natchathiram are considered gods of wealth, prosperity, and success. Hence, Vaigaasi Visaagam is considered an auspicious day for beginning new ventures, activities or other works.