In chapters 5-6 the children go back into the wardrobe. This part is after Peter and Susan talk to the professor

Days later, after talk of the wardrobe has ceased amongst the children, Mrs. Macready, the housekeeper, welcomes a group of adult tourists to the house, which is quite famous. Mrs. Macready leads the group through the house, telling the children to stay out of the way. The children decide to explore the house, but when they realize that they are about to run right into the tour group, they dart into the Wardrobe Room. They hear voices in the passageway, and, concerned that the tour group is about to enter the Wardrobe Room, rush to hide in the wardrobe. Peter, the last to enter, is careful not to shut the door behind them.