IT WILL BE MAGICAL!
The reason I think that this is not a national holiday is because nobody really knows Harry Houdini and his work! So if everybody got a little interested in magic and learned a little about Harry Houdini; this holiday could because a national one.
This Holiday used to be called Houdini Day. They used to call it that because of the famous Harry Houdini and his amazing magic! He is known for escaping chains, ropes, handcuffs, and strait jackets, while dangling upside-down in front of his audience.