Holy Saturday

This is the seventh day of the [Holy] week, the day Jesus rested in the tomb. In the first three Gospel accounts this was the Jewish Sabbath, which provided appropriate symbolism of the seventh day rest. While some church traditions continue daily services on Saturday, there is no communion served on this day.

Some traditions suspend services and Scripture readings during the day on Saturday, to be resumed at the Easter Vigil after sundown Saturday. It is traditionally a day of quiet meditation as Christians contemplate the darkness of a world without a future and without hope apart from God and his grace.

It is also a time to remember family and the faithful who have died as we await the resurrection, or to honour the martyrs who have given their lives for the cause of Christ in the world.

...Holy Saturday has traditionally been a time of reflection and waiting, the time of weeping that lasts for the night while awaiting the joy that comes in the morning (Psa 30:5).
-The Days of Holy Week
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In the primitive Church Holy Saturday was known as Great, or Grand, Saturday, Holy Saturday, the Angelic Night, the Vigil of Easter, etc. It is no longer, like Maundy Thursday, a day of joy, but one of joy and sadness intermingled; it is the close of the season of Lent and penance, and the beginning of paschal time, which is one of rejoicing.

By a noteworthy exception, in the early Church this was the only Saturday on which fasting was permitted (Constit. Apost., VII, 23), 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, and although the moment assigned for breaking the fast at dawn on Sunday varied according to time and country, the abstinence from food on Holy Saturday was general.
-Catholic Encyclopedia: Holy Saturday