As far as I have been able to determine, there are only 8 texts that have any mention about meeting on the first day.
Four of these are a reference to the Resurrection.
They also gathered together in the evening of the first day but they were in fear of the Jews when Jesus appeared to them.
What is not talked about is that this day, the day of the resurrection of Jesus, was also the first day of the Feast of Unleavened Bread. That may not seem significant, but it actually is. This was a feast that all Male Jews were required to attend, and the first day of the feast, which was straight after passover, was considered to be a sabbath day. This is the reason the disciples were still in Jerusalem.
There is another verse that talks about Jesus appearing to them after eight days. This can be interpreted in several ways. It can be eight days after the passover which would make it the last day of the feast of unleavened bread. Or it could be eight days after the resurrection.
If it is eight days after the passover, and therefore the last day of the week of unleavened bread, then this also was considered to be a sabbath day, and being part of the feast, the disciples would still have been required to be in Jerusalem.
There is argument given that the Church also met on the sunday being the day of Penticost. However, this also was a day to be considered as a sabbath day, and was another day that the Male Jews were required to be in Jerusalem.
What I am trying to emphasise in this is that the argument of the church meeting on sundays just after the resurrection, does not stand. There are scriptural reasons as to why the disciples were required to be in Jerusalem on these days.
It just happens to be that in the year that Jesus died, and rose again, these important days fell on a Sunday. In the following years these days would have fallen on another day of the week.
In Acts 20:7 and 1 Cor 16:2 we have two other references to there being a meeting on the first day of the week. Both of these are connected with Paul in his third mission trip which was about 25 years after the resurrection. Paul was in a hurry to be getting back to Jerusalem before Penticost, with the collection he had gathered from the gentile churches, which he intended to present to the Apostles on the day of penticost.
The only other verse which is used as evidence of the church meeting on the sunday is the reference in Rev 1:10 where John is in vision on the Lords day, but in this verse it does not specify which day this was.