Skanda Purana 2.2 chapter 42 describes Sri Krishna Pusya abhiseka as one of the festivals observed for Lord Jagannath in Puri. This chapter gives an elaborate description of the rituals for observing the festival.
In the 27th chapter text 99 of the same section of Skanda Purana the pusya naksatra is also mentioned. There it is said that it was on a Thursday, astami tithi, during sukla-paksa of the month of Vaishakha in conjuction with the pusya-naksatra that that Lord Jagannath was installed in the original temple in Puri.
' Krsna Pusya abhiseka -- During the morning puja, or worship, the Deity or a salagrama is bathed in pure ghee. Srila Prabhupada once explained the festival this way: "Krishna was just a toy in the hands of the Gopis, so one day the Gopis decided that we shall decorate Him. Pusyabhisheka means a ceremony to decorate the deity profusely with flowers, ornaments, cloths. After there should be lavish feasting and a procession through the streets, so that all the citizens should see how beautiful Krishna appears." ' (Krsna-priya Devi Dasi, Vaisnava Academy - Alachua)
Tirupathy Tirumala Devasthanams, South India