Saawan is the holy month that comes every year in July/August. It is month where all women observe "fasting" for their husbands for their long lives . Some people fast for the whole month and some fast on Mondays for Lord Shiva.Almost every day of the month is considered very important .
The story behind this holy month Saawan is that “Churning of Ocean” (Samundra Manthan) took place in this holy month of Shravan. When the Poison came out ,Lord Shiva Swallowed all the poison in his mouth and his throat turned blue because of the poison impact. To reduce the impact of poison Lord Shiva wore the crescent moon on his head and other Gods started offering him the water of Holy Ganges to reduce the poison effect.
Many people go to the holy place Haridwar where they go along with the 'kanvar'. Kanvar is a single pole with two dangling from opposite ends in which they carry the holy water of Ganga and pour it on Lord Shiva’s shivalingm. It is said that when Lord Shiva swallowed the poison then Ravan one of his devotee, brought holy water of Ganga in kanvar.
Lord Shiva is very innocent God and the destroyer of all the evil.During Saawan month you should wear Rudraksha and use it for the Japa.Also keeping Lord Shiva's statue at home is to be around all positive energies. To earn Punya (Blessings) of Lord Shiva observe fast on every Monday of this month.
Say this mantra: OM NAMAH SHIVAY