Apart from observing Ekadasi vratam, one can observe other vratams for Perumal like Sravana vratam. Some observe vratam on Fridays and Saturdays. It is acceptable to observe other vratams for the sake of Perumal.
Notes
Some households have the practice of wearing charadu (thread coated in turmeric paste) commencement of Panguni by observing nonbu (a sort of vratam). One need not fast the whole day as some light refreshments are allowed. Vratam can be observed only with the consent of elders. Some Prapanna households do not have this tradition.