Cont.....
VII - At the Last Supper, on the night when he was betrayed, our Savior instituted the eucharistic sacrifice of his body and blood.  He did this in order to perpetuate the sacrifice of the cross throughout the centuries until he should come again and in this way to entrust to his beloved Bride, the Church, a memorial of his death and resurrection: a sacrament of love, a sign of unity, a bond of charity, a paschal banquet "in which Christ is eaten, the heart is filled with grace, and a pledge of future glory given to US....
(*Notice the mention of Holy Thursday, Good Friday, and Easter Sunday.  Compare with Trent's:   "The Mass is the sacrifice of the New Law in which Christ through the ministry of the priest, offers Himself to God in an unbloody manner under the appearances of bread and wine."  Question 357, Baltimore Catechism)

Your comment is correct in terms of attitudes -