First Monday of Shravan Month (Somvar Vrat) is very important day. Thousands of devotees observe fasting on the day. A special offering is made on the Monday. The main offering is pouring water on the Shivling.
Another important offering made on the first Monday of the Shravan month is a handful of raw rice.
As per Padma Purana observing Shravan Somvar Vrat helps in wish fulfillment.
As per Shiv Mahapuran observing the Monday fasting in Shravan month is equal visiting all the sacred places.