This day is not detailed in the 4 gospels. Peter did write that while Jesus’ body lay in the tomb, His spirit visited “the spirits in prison” to preach to them.
In the Book of Mormon we also read of accounts of a great storm that shook the earth, a darkness descending, and Christ visiting the America’s.
Guards placed in front of the tomb: Matthew 27:62-66
The destruction in the America’s: 3 Nephi 8:6-23
Christ Visits the America’s: 3 Nephi 11
The Spirit World: 1 Peter 3:18-19
Make Empty Tomb Rolls. Discuss each step with your children.