It was not their custom to meet on that day. There was no requirement to break bread on that day. We have an account of only one instance in which it was done. The Bible nowhere says that the first day of the week commemorates the resurrection of Christ. This is a tradition of men, which makes void the law of God.
Baptism commemorates the burial and resurrection of Jesus.
Finally, the New testament is totally silent with regard to any change of the Sabbath day or sacredness for the first day. For he that is entered into his rest, he also hath ceased from his own works, as God did from his. Let us labour therefore to enter into that rest, lest any man fall after the save example of unbelief. He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him. By this we know that we love the children of God, when we love God and keep his commandments.