(courtesy of STEPHAN PASTIS / Universal Uclick)

SOME MONTHS BACK, Comic Riffs asked Stephan Pastis to be a featured guest for our “Graphic Novel Night” Pavilion at the Library of Congress’s forthcoming National Book Festival. When Pastis said yes, The Post (a co-sponsor of the event) replied: Great. Super. Terrific!

What The Post didn’t think to say, though, Rat does — in today’s “Pearls Before Swine” strip.

And true to the feature’s form, Rat’s rejoinder is: “Did the first fifty choices for speaker die?” And in the final panel ,Pig faux-consoles by saying: “It’s okay. They’re only authors.”

(Note to self: Check the festival’s latest mortality tables before sitting for a conversation with Pastis on the evening of Sept. 5, at the Washington Convention Center.)

“Pearls” fans on the syndicate’s website, of course, were quick to bring their own comebacks, including:

“There’s a certain class of people trying to go to Washington right now. Not one you should associate with.” — a commenter named “Bilan”

“I suspect that he’s amused that he, a cartoonist, is being “considered” an author.” — @mammamoonbeam

“Actually, they invited Cartoon-boy to say a single line: ‘this way to your seat, sir’ ” — Mikel V

The other cartoonists participating in Graphic Novel Night — as (a-hem) authors — are Lalo Alcaraz, Keith Knight and Scott Stantis in the 7 p.m. panel, and Miss Lasko-Gross, Diane Noomin and Trina Robbins an hour later.

Pastis and the characters that live in his head will go on at 9 p.m.

The National Book Festival is Sat., Sept. 5, from 10 a.m. to 10 p.m., and is free to the public. Comic Riffs is emceeing the Graphic Novels pavilion.