kalyana vratam is one of the eight auspicious vratas. When the Sun is shining in the Pisces sign(mIna rAsi) that is in the month of paN^guni (mid of March to mid of April) on the uththara naxaththiram on the Moons growing face (shukla paxam), this vratam is observed. This is the day Shakthi married Lord Shiva after a great austerity in the Himaalayas, as the daughter of Himavaan. It is also observed as the auspicious day when Lord Muruga married devaseenaa. This vratam is explained in the skandha purANam.