The first precept ("You shall attend Mass on Sundays and holy days of obligation and rest from servile labor") requires the faithful to sanctify the day commemorating the Resurrection of the Lord as well as the principal liturgical feasts honoring the mysteries of the Lord, the Blessed Virgin Mary, and the saints; in the first place, by participating in the Eucharistic celebration, in which the Christian community is gathered, and by resting from those works and activities which could impede such a sanctification of these days. (Catechism of the Catholic Church 2042)
Thursday, November 1st is a Holy Day of obligation - the Solemnity of All Saints'. On this day, every Catholic is obligated to attend Mass (unless there is a grave cause which prevents him). It is a mortal sin to purposefully skip a holy day.
On a more positive note, we recognize that the Solemnity of All Saints' is an opportunity for us to recall the fellowship which we have with all the holy men and women who have gone before us, and who have been recognized by the Church for their heroic sanctity. These are not simply individuals who died long ago, bu they are our true friends and close companions! The saints are with us always. If only we were more mindful of their presence and their constant prayers, we would be much more joyful!
At Corpus Christi, there will be a vigil Mass on Wednesday eve (which counts for the Holy Day), as well as two Masses on November 1st.
Wednesday, October 31st - 5:30pm (vigil)
Thursday, November 1st - 6:30am and 5:30pm