Zeena always came back laden with expensive remedies, and her last visit to Springfield had been commemorated by her paying twenty dollars for an electric battery of which she had never been able to learn the use.
There are no more uses of "commemorate" in the book.
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I have dwelt upon the greatness of Athens because I want to show you that we are contending for a higher prize than those who enjoy none of these privileges, and to establish by manifest proof the merit of these men whom I am now commemorating.
Thucydides -- Pericles’s Funeral Oration
The desk seems to have no purpose other than holding Dorothy’s collection of snow globes from places that seem unworthy of commemoration: Gulf Shores, Alabama.