Boxer Floyd Mayweather Jr. speaks onstage during the BET Awards in Los Angeles on June 29. (Kevin Winter/Getty Images, for BET)

As skilled as Floyd Mayweather is inside the boxing ring, the undisputed pound-for-pound world champion also can be a master showman outside of it. The latest evidence of that is his four-day, five-city, cross-country press tour to promote a rematch against Marcos Maidana Sept. 13 in Las Vegas.

Mayweather is scheduled to appear at Constitution Hall Monday night for the second leg of that junket, with boxing bravado serving as only part of the festivities. Following a news conference featuring both camps, Grammy-nominated rapper and District native Wale will perform.

The event is free and open to the public. Fans are asked to arrive at 6:30 p.m., as doors will open shortly thereafter, before the news conference begins at 7:15.

Mayweather is coming off a 12-round majority decision over Maidana May 3 at the MGM Grand Garden Arena. One judge scored the fight 117-111 and another 116-112 while a third judge had it 114-114, prompting Mayweather to issue a rematch that promises another mega-payout with the World Boxing Council and World Boxing Association titles on the line again.

The highest-paid athlete in the world according to Forbes was guaranteed a minimum of $32 million for his first encounter with Maidana. That was part of a six-fight, 30-month contract the five-division world champion signed with Showtime in February 2013. Following the Maidana rematch, Mayweather, 37, has two fights remaining in his deal.

The 10-time world title winner last came to the District in June 2013, stopping at the Howard Theatre to promote a fight against Saul Alvarez at a catch weight of 152 pounds. Mayweather won that bout via majority decision and claimed a record purse of $41.5 million, according to published reports.

Mayweather’s press tour for his rematch against Maidana begins Monday morning in New York City, with stops this week in Chicago, San Antonio and Los Angeles.