Matsyapurana 17.12

17.12

vivikteṣūpalipteṣu śrāddhaṃ deyaṃ vijānatā
viprānpūrve pare cāhni vinītātmā nimantrayet //

Śrâddha should be performed on the full moon day, in the month of Vaiśâkha, at the time of an eclipse, on the occasion of the sacred-thread ceremony and Mahâlaya festival, in a holy city (tîrtha), near a place where cows are kept, in gardens illuminated with lamps and in villas after plastering the floor with cowdung; and the Brâhmaṇa guests should be invited to the feast the same day or a day previous in the manner mentioned before.--11-12.