Is there a special name for the day between Easter and Good Friday? I have always called it Sad Saturday in an effort to highlight the despair the disciples must have felt after seeing their Lord killed.

This answer covers a lot of those days in there (most clearly come from Catholic tradition), but only refers to the Saturday between Good Friday and Easter as the last day of the Holy Triduum.

Is there a special name, from any tradition, for the day between Easter and Good Friday?
Liturgy Brisbane calls it &quot;Holy Saturday.&quot;
According to the Catholic Encyclopedia, it is a day of both joy and sadness, and &quot;in the early Church this was the only Saturday on which fasting was permitted, and the fast was one of special severity. Dating from the time of St. Irenaeus, an absolute fast from every kind of food was observed for the forty hours preceding the feast of Easter.&quot;
The names for the full week:

Passion Sunday (Palm Sunday)
Monday of Holy Week
Tuesday of Holy Week
Wednesday of Holy Week
Thursday of Holy Week (also called Maundy Thursday in reference to Jesus' command to wash each other's feet)
Good Friday
Holy Saturday


The days following Easter Sunday are called Easter Monday, Easter Tuesday and so on through to Easter Saturday, which is 6 days after Easter Sunday
The Sundays of the Easter Season are named the Second Sunday of Easter, etc, not after Easter as in the past, because they fall with in the 50-day Season of Easter.
(Liturgy Brisbane)