Why does the Church do what it does on the Lord's Day gathering (i.e., Sunday morning corporate worship)? Because that's what it has always done. Just ask Justin...
On the day called Sunday there is a gathering together in the same place of all who live in a given city or rural district. The memoirs of the apostles or the writings of the prophets are read, as long as time permits. Then when the reader ceases, the president [pastor] in a discourse admonishes and urges the imitation of these good things. Next we all rise together and send up prayers.So, as we look toward the next Lord's Day, we hope, not for ingenuity or creativity, but more of the same.
When we cease from our prayer, bread is presented and wine and water. The president in the same manner sends up prayers and thanksgivings, according to his ability, and the people sing out their assent, saying the 'Amen.' A distribution and participation of the elements for which thanks have been given is made to each person, and to those who are not present they are sent by the deacons.
Those who have means and are willing, each according to his own choice, gives what he wills, and what is collected is deposited with the president. He provides for the orphans and widows, those who are in need on account of sickness or some other cause, those who are in bonds, strangers who are sojourning, and in a word he becomes the protector of all who are in need.
But Sunday is the day on which we all hold our common assembly, because it is the first day on which God, having wrought a change in the darkness and matter, made the world; and Jesus Christ our Savior on the same day rose from the dead.
For He was crucified on the day before that of Saturn (Saturday); and on the day after that of Saturn, which is the day of the Sun, having appeared to His apostles and disciples, He taught them these things, which we have submitted to you also for your consideration.
- First Apology, 67.
HT: Pulpit Mag