On Monday, Harper said he'd like to play for the Nationals' manager "for the next 10, 12 years."
The flash sale applies to lower-level outfield seats for five upcoming games.
Tuesday's moment will take place at the end of the fifth inning.
BreakingT will have a designer on hand at its Nationals Park retail stand.
Norman and Wall both had a pair of hits, but the biggest cheers of the night were reserved for Nationals fan Bill Nye the Science Guy.
The Nationals, Yankees, Mariners, Marlins, Orioles, Rays and Royals all distanced themselves from John Schnatter and his pizza chain, while the Astros said they were “incredibly disappointed with the statements” he made.
Washington's latest acquisition defended his character during an Instagram Live session.
Harper will debut some snazzy American flag-themed footwear for Monday's Home Run Derby at Nationals Park.
D.C. United's new home will also feature more traditional stadium fare.
Members of the U.S. Olympic and Paralympic teams presented the president with a pair of signed flags.