The time for celebrating the Shraddha, O Yudhishthira, is that when one gets a good Brahmana and curds and clarified butter and the sacred day of the new moon and the meat of wild animals such as deer and others.
श्राद्धस्य ब्राह्मणः कालः प्राप्तं दधि घृतं तथा। सोमक्षयश्च मांसं च यदारण्यं युधिष्ठिर॥