It's the third day, after the saviour's tomb was found empty. The
third day after the evel living has manifested his divinity by
showing himself alive to The Holy Virgin Mary (Theotokos) to Mary
Magdalene and to few of the Holy Apostles.
The upcoming week is called within the Church The Bright
Week
The whole week is a week of a divine spiritual joy which we all the
Christians experiens (feels).
God is really graceful to us the sinners in this holy days of the
year.