1. Fast before Mass. It is required that one fasts for at least 1 hour before receiving Holy Communion. The only exceptions are medicine, water or unless someone is ill and needs to eat sooner.
2. No Food and Drink in Church. The only exceptions would be milk for infants, water for the priest or choir (if discreet) and water for those who are ill. You may sip water just before you enter the church.
3. Men take your hats off. It is impolite to wear a hat into any church for a man.
4. Never chew gum in church! It breaks your fast and it’s distracting!
5. Cross yourself with Holy Water on entering and leaving the church. This is a reminder of our Baptism, which made us members of Christ's Church.
6. Dress modestly and appropriately. Wear your Sunday Best. As Catholics we believe that God comes down to meet us at every Mass. Won't you dress well to meet a king? That said remember that the mass is not a fashion show. And Christmas and Easter masses are not Milan Fashion week. Dress in a way that gives witness to your faith.
7. Show up at least a few minutes early and try coming as close to the altar as possible. If you can't be on time, then sit in the back so you don't disturb others.
8. Cell phones should never be used in Mass for calls or texting. The ONLY exceptions are emergencies (big ones, not everyday ones) and if you are using the phone for readings the lectionary or the said prayers/ responses.
9. Gentlemen offer their seats to a any lady who is standing. Some churches get packed.
10. When we enter and leave Church, genuflect (bow your knee) toward the Tabernacle. Christ is present for our sake. By allowing our right knee to hit the floor, we acknowledge He is our Lord and God. If someone is physically unable to genuflect, then a bow is sufficient. During Mass, if you pass in front of the altar or tabernacle, bow reverently.
11. Sit quietly while in church. If you must talk do so as quietly and briefly as possible. Remember that your conversation might be disturbing someone who is in prayer. Sssshhhhhhhh.
12. Take loud children to the back. Every parent knows that sometimes the baby is going to have a bad day. Parents with young kids should sit on the end of a pew, if you can, so that you can take the kid to the back quickly. There is no reason to be embarrassed about having to quiet your child, take the child to the back of the church immediately. It is worse to allow them to disturb others during Mass.
13. Prepare your offering before Mass. Christ tells us not to let your left hand know what your right hand is doing when you make your offering. Keeping the basket while you get your wallet out can be quite a scene. Digging the basket for change is a big no no. Come to mass with your offering prepared.
14. No bulletin reading during Mass. Imagine if you invited a guest to your house and before dinner (or during) they decided to read a magazine instead of talking to you.
15. Respect the worship. Stand during the gospel reading and other set time during worship. Kneel at the consecration, it is part of worship. The only exceptions are fir the sick, people with knee problems, aged and those with infants. If you can't kneel occupy a pew that does not obstruct the view of the Lord from those who do kneel.
16. Bow before receiving Holy Communion Remember that you are before your Lord, show your respect with a profound bow from the hip.
17. Do not receive from the chalice if you are sick. This is an act of charity. Try to receive communion on the tongue. If you insiston receiving on the hand, check your hands after receiving the Lord so that no crumbs may fall to the ground.
18. Do not leave early. We should stay to the end of the recession and the hymn that accompanies it, if there is one. Remember who left the last supper early (Judas).
19. Pray after Mass, if you can. It is a good custom, though not required, to offer a prayer of thanksgiving after Mass is over.
20. Leave quietly. We encourage you to visit others especially your priests as a part of Christian fellowship, but once you are outside of the main sanctuary of the church so you won't disturb others who are praying.