Because it is a catholic celebration of the Eucharist in Mass.
Every religion has to keep its followers on the path to their own versions of righteousness. Therefore keeping them all in one place and telling them the benefits and rewards for their faithfulness is the way to do this. However many times a week, month, year, lifetime you must attend is entirely dependent on the religion.
Because you're in church and praying. It's important to think about other people as well.
What Mass? If you are talking about a "Church" mass, then it would be located in a Church or Chapel.
hmmm, God, mass, eucharist, confession, mortal sin,
in a church
The true church. The followers of Jesus Christ. The believers are the church.
Catholics have always assisted at Mass in a Church.
Mass
The Basilica is a monument to Saint Peter, the first Pope, who happens to be buried under it. It is the church used by the pope for important celebrations, such as canonizations and Christmas Eve midnight Mass.
Usually when people are hearing Mass in a Church, they are referred to as the "congregation".
"Mass" is a church service ... not a sacrament.
They call in the Eucharist in the Episcopalian Church.
John Joseph Ryan has written: 'St Paul Church, Cambridge, Mass' -- subject(s): Catholic Church, Catholic Church. Archdiocese of Boston (Mass.), History, St. Paul's Church (Cambridge, Mass.)