Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 11
Sanskrit:
पृथक् सत्रेण वा मह्यं पर्वयात्रामहोत्सवान् ।कारयेद् गीतनृत्याद्यैर्महाराजविभूतिभि: ॥ ११ ॥
ITRANS:
pṛthak satreṇa vā mahyaṁparva-yātrā-mahotsavānkārayed gīta-nṛtyādyairmahārāja-vibhūtibhiḥ
Translation:
Either alone or in public gatherings, with singing, dancing and other exhibitions of royal opulence, one should arrange to celebrate those holy days, ceremonies and festivals set aside specially for My worship.