Why were the disciples assembled on the first day of the week? John 20:19 For fear of the Jews

The disciples were not holding a meeting to honor the resurrection. They did not even believe in the ressurrection at this point. They were meeting behind locked doors for fear that the same thing that happened to Jesus would happen to them. They were afraid for their lives. Jesus appeared to these frightened disciples on the same day that He rose from the dead. Nothing here indicates a change in the day of worship. What did Paul ask the Corinthians Christians to do on the first day of the week? 1 Corinthians: Upon the first day of the week let every one of you lay by him in store as God has prospered him. The New Testment in the Language of Today says: Each of you should at home lay aside money he makes and save it. Paul was reguesting money for the Jerusalem Christians who were suffering from famine. He was instructing the Corinthian Christians to prepare for this offering by laying aside at home a certian amount of money each week for this special offering. Please understand that this was an individual laying aside, and not a collective laying aside at a church meeting. There is nothing in this text to indicate there was a collection occurring in church on the first day of the week they were putting aside money for this offering that would be collected later, when Paul arrived. There certainly is no evidence there for Sunday keeping.