There are various Vrata & puja mentioned Gurucharitra .Following are they
1)Shanipradosh Vrata
At Kurvpur , Shree Shripad ShreeVallabh save the mother-son who were trying to commit suicide and ask her to do Shanipradosh vrata.Shani Pradosh vrat a Saturday(Sanivar) in any lunar fortnigh. Due to Shani Pradosh Vrat She was mother of Nrasinh Sarswathi in next birth.
2)Ekadashi Vrata
Ekadashi is a sacred day, occurring twice a month in the Hindu calendar - on the eleventh day of the bright half - called Shukla Paksha and on the eleventh of the dark half called Krishn Paksha. A fast is to be observed on this day by all Hindus. During Ekadashi, a waterless fast is ideal. However those unable to fast may take liquids, or if needed farari foods.
In Gurucharitra 3 Adhyay there is story of King Ambarish & Durvas Rushi tells that Ambarish made Ekadashi Vrata. He induced Shri Vishnu to come to Earth.