Wikipedia
Vasanthotsavam
Vasanthotsavam is an annual Seva celebrated in Tirumala to celebrate the arrival of spring season.
Vasantotsavam is the combination of 2 words - "Vasantha" (Spring season in Sanskrit) and "Utsavam" (festival in Sanskrit). The festival is celebrated on the three days of tryodasi, chaturdasi and pournami in the month of Chaitra In the Gregorian calendar, the festival occurs between the end of March through mid-April.