When a close relative has attained ascension, celebrating festivals for one year depends on the practice of the relevant household.
Some houses do not celebrate festivals for the whole year if a paternal aunt has passed away, some celebrate in a low key. But if a festival occurs during the Maasyam, it is better not to celebrate festivals that year. If a festival falls on the first year shraddha of the departed, it is not a must that that festival need not be celebrated. For example, if a person has departed on Srijayanthi day, and when the first-anniversary sraddha is performed during next year’s Srijayanthi day, only the kartha is prohibited from celebrating Srijayanthi. All his relatives can celebrate Srijayanthi.