Better Days for doing Gaya Shradha or Pind Daan
1) In Makar Rashi when Moon is in SUN
2) On Amavasya and Poornima Ekadashi
3) when Surya is in mesha,Meena,kanya Dhanu and vrusha rashi
4) in Krishna Paksha of Phalgun month,Chaitra,Paush,Vaishakha.
Ekodrishti Shradh: Ekodrishti Shradh means that it should complete in one day only. It is done on three important vedies (place of sharadh) Falgu River,Vishnupad Vedi and Akshay Vat vedi except abnormal death.
Vrihad Shradh: Vrihad Shradh means that it should complete on 54 vedies which is mention in above where that pilgrims have to performed Pind Daan