Easter Monday.

Christianity.com: What is Easter Monday and Why Do We Celebrate It?

Easter Monday may not be the first thing you think of when you remember the Easter calendar, but it highlights an important part of the Easter story: what happened after Jesus got out of the tomb?
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Easter Monday is a continuation of the joy of Easter Sunday. On Easter Monday, Christians celebrate that Jesus is alive, and therefore, we can find new life in Him. Easter Monday is celebrated differently in various parts of the world and within different denominations.
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What Follows Easter Monday?

When the resurrected Christ first appeared to the disciples, Thomas was not with them. The disciples told him what they saw, but Thomas said he would need to see Christ’s nail-pierced hands for himself to believe. A week later, Jesus revisited the disciples. This time, however, Thomas was with them. Jesus showed Thomas his scars, and he believed. Jesus said, “Because you have seen me, you have believed. Blessed are those who have not seen and yet have believed.”