It involves a yet-to-be-named “New York PR agency on behalf of the Smithsonian Institution.
Here’s the key section of the letter in question:
Now that baseball season is in full swing, it is the perfect time to inform your readers about this exciting exhibition at the Smithsonian Institution. If there has ever been a museum exhibition to highlight in [TRASHY MEN’S PUBLICATION], Baseball As America is it. Please let me know if I can provide any additional information or visuals.”