In the article “Stamp Announcement 17-11: John Fitzgerald Kennedy Stamp,” in Postal Bulletin 22459, (1-19-17, pages 54-55), the Special Dedication Postmarks were not available.
The information and graphics for the John Fitzgerald Kennedy Special Dedication Postmarks are shown here:
Only the following pictorial postmark is permitted for the John Fitzgerald Kennedy stamp. The word “Station” or the abbreviation “STA” is required somewhere in the design, because it will be a temporary station.
To finalize the John Fitzgerald Kennedy stamp pictorial postmark art, insert the date, city, state, and ZIP Code™ of the physical location of your event adjacent to the stamp image. Overall dimensions of the pictorial postmark must not exceed 4 inches horizontally by 2 inches vertically. Collectors prefer the dimensions 3-1/2 inches by 1.
The Postal Service™ must make all special postmarks known to collectors through advance publicity in the Postal Bulletin. Therefore, all special dedication cancellations must be reported to Stamp Services four weeks before the event using PS Form 413, Pictorial Postmark Announcement/Report. To get a copy of the form, go to http://blue.usps.gov/formmgmt/forms/ps413.pdf.
— Stamp Services, Marketing, 2-2-17