Mahotsava

“Utsava means ‘pleasure.’ Whenever some function takes place to express happiness, it is called utsava. Utsava, the expression of complete happiness, is always present in the Vaikunthalokas, the abode of the Lord, who is worshipable even by demigods like Brahma, to say nothing of other, less important entities such as human beings.” (Shrila Prabhupada, Shrimad Bhagavatam, 3.19.31 Purport)