There are some beliefs regarding worshipping Lord Shiva. People say the lovers must worship him, in order to have a strong love life. The ladies worship him to get dream husbands like him. It also helps you to deal with chronic diseases. If you have desire to carry baby, without facing any problem, you can definitely try to have faith in him. Sada Shiv is worshipped by those, who want to achieve higher goals in life.
The main festival you can see regarding this Puja is Shivratri. Normally Hindu women do this ritual. On this day, Lord Shiva married Parvati. Women worship Shiva to get the blessing of having a loving and passionate husband like him. It happens on the month of Phalgun that is on February or March. They fast, until they offer cow milk to the Shiva Linga.