The smritis ordain that one must observe an Acaray’s tiruvadhyayana day like how one celebrates an Acaryan tirunakshatram. Tiruvadhyayanam can be performed like a shraddham by a disciple. If that is not possible, after performing a special Perumal Tiruvaradhanam, offer a sambhavanai to Acarayan and partake Acarya Sripadha theertham.