We receive the Holy Sacrament at every Mass. First Communion is typically in May for our Second Graders and at the Easter Vigil for adults in RCIA and children in religious education.
Before we receive the Eucharist at Mass, we must prepare ourselves for a great and holy moment of sanctification.
St. Paul urges us to examine our conscience: "Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of profaning the body and blood of the Lord. Let a man examine himself, and so eat of the bread and drink of the cup. For any one who eats and drinks without discerning his body eats and drinks judgment upon himself." (1 Corinthians 11:27-29)
Therefore the Catechism says "Anyone conscious of grave sin must receive the sacrament of Reconciliation before coming to communion." (CCC 1385) In addition to ensuring that we are not in a state of grave sin, it is important to prepare ourselves to receive this most holy gift of Jesus' Body and Blood through prayer and reflection.
Some questions for reflection
Many of Jesus' followers left him and returned to their former way of life because his teaching was too difficult for them to accept, but Jesus was undeterred. He didn't change his teaching on the Eucharist in order to make them stay with him. (John 6) Commenting on Luke 22:19 ("this is my body which is given up for you.") St. Cyril says: "Do not doubt whether this is true, but rather receive the words of the Savior in faith, for since he is the truth, he cannot lie." (Catechism of the Catholic Church 1381)
The principle fruit of receiving the Eucharist is an intimate union with Christ Jesus. (CCC 1391) Indeed, the Lord said: "He who eats my flesh and drinks my blood abides in me and I in him (John 6:56.) What material food produces in our bodily life, Holy Communion wonderfully achieves in our spiritual life. (CCC 1392)