The United States Postal Service cordially invites you to attend the Happy Birthday commemorative Forever stamp first day of issue pop-up. The ceremony will take place on Saturday, April 18, 2026 at 11 a.m. Eastern at Track 15 of Providence, RI's Union Station (1 Union Station, Providence, RI). To attend the event, please RSVP at usps.com/happybirthdaystamp.