What:

The U.S. Postal Service will honor American artist Roy Lichtenstein with five commemorative Forever stamps featuring his colorful pop art.

The first-day-of-issue event for the stamps is free and open to the public. News of the stamps is being shared with the hashtag #RoyLichtensteinStamps.

Who:

Tom Marshall, U.S. Postal Service general counsel and executive vice president, will serve as dedicating official.

When:

Monday, April 24, at 11:30 a.m. ET