Jesus showed Himself after death. When the disciples were walking down the road. When they were fishing. Jesus never mentioned the Sabbath.
John 20:25-28
25 The other disciples therefore said to him, "We have seen the Lord." So he said to them, "Unless I see in His hands the print of the nails, and put my finger into the print of the nails, and put my hand into His side, I will not believe."
26 And after eight days His disciples were again inside, and Thomas with them. Jesus came, the doors being shut, and stood in the midst, and said, "Peace to you!"
27 Then He said to Thomas, "Reach your finger here, and look at My hands; and reach your hand here, and put it into My side. Do not be unbelieving, but believing."
28 And Thomas answered and said to Him, "My Lord and my God!"
(NKJ)
John 21:1-17
1 After these things Jesus showed Himself again to the disciples at the Sea of Tiberias, and in this way He showed Himself:
2 Simon Peter, Thomas called the Twin, Nathanael of Cana in Galilee, the sons of Zebedee, and two others of His disciples were together.
3 Simon Peter said to them, "I am going fishing." They said to him, "We are going with you also." They went out and immediately got into the boat, and that night they caught nothing.
4 But when the morning had now come, Jesus stood on the shore; yet the disciples did not know that it was Jesus.
5 Then Jesus said to them, "Children, have you any food?" They answered Him, "No."
6 And He said to them, "Cast the net on the right side of the boat, and you will find some." So they cast, and now they were not able to draw it in because of the multitude of fish.
7 Therefore that disciple whom Jesus loved said to Peter, "It is the Lord!" Now when Simon Peter heard that it was the Lord, he put on his outer garment (for he had removed it), and plunged into the sea.
8 But the other disciples came in the little boat (for they were not far from land, but about two hundred cubits), dragging the net with fish.
9 Then, as soon as they had come to land, they saw a fire of coals there, and fish laid on it, and bread.
10 Jesus said to them, "Bring some of the fish which you have just caught."
11 Simon Peter went up and dragged the net to land, full of large fish, one hundred and fifty-three; and although there were so many, the net was not broken.
12 Jesus said to them, "Come and eat breakfast." Yet none of the disciples dared ask Him, "Who are You?"-- knowing that it was the Lord.
13 Jesus then came and took the bread and gave it to them, and likewise the fish.
14 This is now the third time Jesus showed Himself to His disciples after He was raised from the dead.
15 So when they had eaten breakfast, Jesus said to Simon Peter, "Simon, son of Jonah, do you love Me more than these?" He said to Him, "Yes, Lord; You know that I love You." He said to him, "Feed My lambs."
16 He said to him again a second time, "Simon, son of Jonah, do you love Me?" He said to Him, "Yes, Lord; You know that I love You." He said to him, "Tend My sheep."
17 He said to him the third time, "Simon, son of Jonah, do you love Me?" Peter was grieved because He said to him the third time, "Do you love Me?" And he said to Him, "Lord, You know all things; You know that I love You." Jesus said to him, "Feed My sheep.
(NKJ)