Question: On which anniversary of a march that was hold in Washington, D.C. on Wednesday, August 28, 1963, is the second Atlanta tribute of WOW Gospel 2013 is based?

Context paragraphs:
WOW Gospel 2013: WOW Gospel 2013 is a gospel music compilation album from the award-winning WOW series.  Released on January 29, 2013, the double CD album features thirty contemporary gospel hits.  The album cover pay tribute to Atlanta, Georgia, and it is second "WOW Gospel" album to do so ("WOW Gospel 2007" is the first).  The second Atlanta tribute is based on the 50th anniversary of the March on Washington for Jobs and Freedom and the "I Have a Dream" speech by Martin Luther King, Jr. The album topped out at #1 on the "Billboard" Gospel Albums chart and #43 on the "Billboard" 200 chart.

WOW Gospel 2011: WOW Gospel 2011 is a gospel music compilation album from the award-winning WOW series.  Released on February 1, 2011 (which made it the first annual "WOW Gospel" album in the history of the series not released in January), the double CD album features thirty contemporary gospel hits.  The album cover pays tribute to Philadelphia, Pennsylvania.  The album debuted straight at number one on the Billboard Gospel Albums chart, and peaked at number 29 on the "Billboard" 200 in 2011.

March on Washington for Jobs and Freedom: The March on Washington for Jobs and Freedom, the March on Washington, or The Great March on Washington, was held in Washington, D.C. on Wednesday, August 28, 1963.  The purpose of the march was to advocate for civil and economic rights for African Americans.  At the march, Martin Luther King Jr., standing in front of the Lincoln Memorial, delivered his historic "I Have a Dream" speech in which he called for an end to racism.

Patrick Dopson: Patrick DeWayne Dopson (born August 24, 1978) is an American gospel musician.  He started his music career, in 2012, with the release of "Open the Heavens" by Oilonit Music, which is his own label, and Central South Distribution.  This album was his "Billboard" magazine breakthrough release upon the Gospel Albums and Heatseeker Albums charts.  The song, "Keep Me", was placed on both the "WOW Gospel 2013" CD and DVD (music vid).

WOW Gospel 1998: WOW Gospel 1998 is a gospel music compilation album in the WOW series.  It was released on January 27, 1998 and is the first WOW album to feature and focus on contemporary gospel in the wake of its growing popularity at the time, thus setting high standard for future releases.  It reached chart position 100 on the Billboard 200, and second place on the Billboard Top Gospel Albums chart.

WOW Gospel 2012: WOW Gospel 2012 is a gospel music compilation album from the award-winning WOW series.  Released on January 24, 2012, the double CD album features thirty contemporary gospel hits.  The album cover pays tribute to Los Angeles, California, with a side tribute to the San Francisco Bay Area on the back album cover notes.  The album peaked at number one on the Billboard Gospel Albums Chart, and number 30 on the "Billboard" 200 chart.

WOW Gospel 2010: WOW Gospel 2010 is a gospel music compilation album from the WOW series.  It was released on January 26, 2010 and features thirty gospel hits on a double CD set.  The album cover pays tribute to Detroit, Michigan.  The album held number one position for several weeks on Billboard's Top Gospel Albums chart, and reached number 40 on the "Billboard" 200 chart in 2010.

WOW Gospel 2007: WOW Gospel 2007 is a gospel music compilation album from the WOW series.  Released January 30, 2007, it showcases thirty-one contemporary Gospel songs on a double CD set.  It reached 21 on the Billboard 200 chart in 2007, and made number one on the Top Gospel Albums chart.  The album cover pays tribute to Atlanta, Georgia.

WOW Gospel 2005: WOW Gospel 2005 is a gospel music compilation album in the WOW series.  Released, January 25, 2005, it included thirty-one tracks on a double CD album.  It reached 29th place on the Billboard 200 chart in 2005, first place on the Top Gospel Albums chart in both 2005 and 2006, and 13th spot on the Top R&B/Hip-Hop Albums chart.  The album cover pays tribute to Washington, D.C.

WOW Gospel 2006: WOW Gospel 2006 is a gospel music compilation album from the WOW series.  Released on January 31, 2006, it comprises thirty-two songs on a double disc album.  The release reached 20 on the Billboard 200 chart in 2006, the highest peak of any of the WOW Gospel series thus far, and made number one on the Top Gospel Albums chart.  The album cover pays tribute to Chicago, Illinois.

Supporting paragraphs: WOW Gospel 2013 March on Washington for Jobs and Freedom
Answer: 50th