Saturdays are, traditionally, the days Catholics go to Confession in preparation for receiving the Eucharist on Sundays. Some Catholics might make a habit of going to Confession on Saturdays; other might go before Mass on Sunday, or might go only when they need to confess, or on some other schedule.
Sundays are, of course, the day for renewing Christ's once and for all Sacrifice during the Sacrifice of the Holy Mass. Because Christ rose from His tomb on Sunday, Sabbath was changed from Saturday to Sundays, or "the Lord's Day." On this day we fulfill God's Third Commandment, to "remember the sabbath day [which means "rest", not "Saturday"], to keep it holy." We refrain from unecessary servile work and fulfill our "Sunday Obligation" to attend Mass.
New reading each day for the English, Welsh, Irish and Scottish martyrs
Devotion for every Day of the Week- mystery of the Rosary
Resurrection & the Holy and Undivided Trinity
The Holy Ghost & the Souls in Purgatory
The Holy Angels
The Blessed Sacrament
Christ's Passion and His Sacred Heart
The Blessed Virgin and her Immaculate Heart.