Radonitza
Radonitza (Russian: "Day of Rejoicing"), is a day of commemoration of the departed. Because the celebration of any memorial service for the departed is forbidden from Holy Thursday through Thomas Sunday, a popular tradition has arisen of visiting the graves of departed loved ones and chanting memorial servcies on the first day this is permitted. There are no special hymns appointed in the Pentecostarion for Radonitza, and nothing different is done in the Daily Office. However, after the Divine Liturgy, it is customary for the faithful to visit cemeteries and serve memorial services, and to give alms in the name of the departed. It is not unusual for families to bring a picnic with them to the cemeteries, which would include paschal foods, especially Easter eggs. Some people leave Easter eggs on the graves of their beloved departed as a way of giving the Paschal greeting to the departed, and as a sign of their belief in the resurrection of the dead.
Read more about this topic: Pentecostarion, Afterfeast of Pascha, Thomas Sunday