FYI: Diogenes Laertius, book X.18.
"And from the revenues made over by me to Amynomachus and Timocrates let them to the best of their power in consultation with Hermarchus make separate provision (1) for the funeral offerings to my father, mother, and brothers, and (2) for the customary celebration of my birthday on the tenth day of Gamelion in each year, and for the meeting of all my School held every month on the twentieth day to commemorate Metrodorus and myself according to the rules now in force.31 Let them also join in celebrating the day in Poseideon which commemorates my brothers, and likewise the day in Metageitnion which commemorates Polyaenus, as I have done hitherto."