Millben has performed for four consecutive U.S. Presidents: George W. Bush, Barack Obama, Donald Trump, and Joe Biden.

Millben was invited by former First Lady Laura Bush as a guest soloist for the 2008 White House Holiday Season, birthing her professional career.

[8] Upon invitation from Cui Tiankai, the Chinese Ambassador to the United States, Millben performed The Star-Spangled Banner and the March of the Volunteers for the 40th Anniversary of U.S.–China Student Exchanges at the Embassy of China in Washington, D.C., on November 21, 2019.

Mary performed the US national anthem for the 45th Anniversary of the Establishment of Diplomatic Relations Between China and the United States and the 2024 Chinese New Year January 17, 2024 hosted by His Excellency Xie Feng, Chinese Ambassador to the United States at the Chinese Embassy in Washington, D.C.[9] In June 2023, Millben performed the National Anthem of India at the Ronald Reagan Building during the US visit of Prime Minister Narendra Modi hosted by President Joe Biden.

[11] Milliben echoed support for Citizen Amendment Bill passed by Indian parliament and called it a true democratic move.