Whenever January 1, the solemnity of Mary, Mother of God, or August 15, the solemnity of the Assumption, or November 1, the solemnity of All Saints, falls on a Saturday or on a Monday, the precept to attend Mass is abrogated. In some dioceses the Solemnity of the Ascension is celebrated on the Seventh Sunday of Easter.
You shall confess your sins at least once a year. 
This is especially obligated for those who are conscious of serious sin. Regular reception of the Sacrament of Penance and Reconciliation helps to prepare us not only to receive the Eucharist but also to continue the process of conversion begun in Baptism.

You shall receive the Sacrament of the Eucharist at least during the Easter season. 
Because the Holy Eucharist is both the source and summit of life for all in the Church, the Church teaches that every member for his or her own good must receive Communion at least once a year, but reception is encouraged as often as possible.

You shall observe the prescribed days of fasting and abstinence. 
Fasting is refraining from food or drink to some degree. Abstinence is refraining from eating meat.
During Lent we observe fasting and abstinence on Ash Wednesday and Good Friday. And the faithful are to abstain from meat on all Fridays of Lent.
In recognition of Friday as the day of the crucifixion, canon law calls for abstinence from eating meat on all Fridays of the year (see Canon 1251).  The bishops of the United States have determined that outside of the Fridays of Lent, Catholics may choose to substitute another penance that is particularly meaningful to them, although they continue to recommend abstinence on all Fridays for Catholics.

You shall help to provide for the needs of the Church.
This means contributing to the support of the activities of the Church with time, talent, and financial resources, each according to their ability.