Regular Saturday turned into a feast day. The reason is very simple one: all came together to celebrate and to partake in Holy Communion as one Body of Christ. All together: Archbishop, priest, deacon and the people – one community participates in the sacraments of the Church.
Baptismal Liturgy restores the original meaning of the sacraments – the sacraments are celebrations of a community of Christ and not a private or personal event. All the sacraments used to be done in (with) the Divine Liturgy. A newly Baptized and Chrismated person is brought to the Church – the Body of Christ.