Conversation so far:
what was the mirror challenge with Harry Houdini?
In 1904, the London Daily Mirror newspaper challenged Harry Houdini to escape from special handcuffs that it claimed had taken Nathaniel Hart, a locksmith from Birmingham, five years to make.
How long did it take houdini to escape from the special handcuffs that it claimed had taken Nathaniel Hart, a locksmith from Birmingham, five years to make in the mirror challenge?
The escape attempt dragged on for over an hour, during which Houdini emerged from his ghost house several times.
did Harry Houdini have an audience for the Mirror challenge?
It was reported that 4000 people and more than 100 journalists turned out for the much-hyped Mirror challenge event with Harry Houdini
How was the Houdini mirror challenge perceived by the public?
This escape was discussed in depth on the Travel Channel's Mysteries at the Museum in an interview with Houdini expert, magician and escape artist Dorothy Dietrich of Scranton's Houdini Museum.
Did Harry Houdini ever do the mirror challenge again?
Was Harry Houdini awarded or recognized anyway for the mirror challenge?
Harry Houdini was paraded on the shoulders of the cheering crowd, when he broke down and wept. Houdini later said it was the most difficult escape of his career.

Question: when was that?
Self-contained rewrite: when was Harry Houdini paraded on the shoulders of the cheering crowd, when he broke down and wept?