What is the festival? If any JNANI takes birth on earth that itself is called FESTIVAL(Habba). That is why in Sanatana dharma one does not celebrate the birthday so grand. As we should celebrate the birthday of JNANIGALU. So are we not JNANI? You may be but the JNANI is the one who worships superior souls thus reach to supreme Lord. Hence we do Aradhana, Jayanthi, and many events to remember JANIGALU and worship through them the LORD Vishnu. Refer to: birthday topic below. Hence, Sri Vijayadasaru says in their "Ninna volumeyinda nikhila..." song that "habbavanundeno hariye". Means being with JNANIGALU or being part of Jayanthi, vardhanthi, seeing Madhwa brahmins, seeing pandits, meeting those saints who are doing Lord pooja is great HABBA or festival to eye & soul. Also, if some JNANA is acquired by our mind then that itself is a great celebration to ourselves. We should avoid wrong celebrations like mother's day, fathers day, valentine's day and many