That novel, about a trip to see the Oberammergau Passion Play, is called Diary of a Pilgrimage.  
This author wrote a story whose narrator dreams that he falls asleep for a thousand years and wakes up in a "Harrison Bergeron"-like society where there is complete equality. One of his novels tells of a comical attempt to pantomime the word "savoury," as the narrator doesn't know the German word for "savoury" but wishes to order a savoury omelet in Germany. That novel, about a trip to see the Oberammergau Passion Play, is called Diary of a Pilgrimage.  He wrote an collection of essays including "On Getting On in the World" and "On Being Hard Up" which inspired a similarly-titled collection published under the name Jenny Wren. This author of Idle Thoughts of an Idle Fellow is best known for a novel about a trip from Kingston to Oxford undertaken with George, Harris, and the dog Montmorency. For 10 points, name this humorist who wrote Three Men in a Boat.
This author wrote a story whose narrator dreams that he falls asleep for a thousand years and wakes up in a "Harrison Bergeron"-like society where there is complete equality.
Jerome Klapka Jerome