CONCERNING THE DATE OF EASTER -
"Easter is the heart of the entire liturgical year and is not simply one feast among others. The Easter Triduum is celebrated over the arc of three days which is preceded by Lent and is crowned by Pentecost and, therefore, cannot be transferred to another date." (Decree of the Congregation for Divine Worship and of the Discipline of the Sacraments; In time of COVID-19, #1). More from the Holy Father.