Former Pennsylvania Representative Patrick Murphy will headline a September 20 event celebrating the official end of “Don't Ask, Don't Tell.”

Murphy, who spearheaded last year's effort in the House to repeal the law that bans gay and bisexual troops from serving openly, will speak at the invitation of Equality Pennsylvania, the state's largest gay rights group, at Tabu Lounge & Sports Bar in Philadelphia. The free event begins at 5PM.

The event is sponsored by Servicemembers Legal Defense Network (SLDN), the nationwide group dedicated to ending the policy.

“The repeal of 'Don't Ask, Don't Tell' is an important milestone along the journey to achieving LGBT equality in America's military,” said SLDN Executive Director Aubrey Sarvis. “September 20 will be an historic day for our service members and, indeed, our nation. Through the events taking place across the country, we will pay tribute to their service and sacrifice as we look forward to this new era of military service – an era that honors the contributions of all qualified Americans who wish to serve.”

Ted Martin, executive director of Equality Pennsylvania, added: “Following the final repeal of DADT, thousands of gay, lesbian and bisexual Pennsylvanians will be able to serve their country in the military without lying about who they are. A bipartisan group of Pennsylvania's congressional delegation supported the repeal, proving once again that our civil rights are not a Democrat or a Republican issue. We look forward to this same bipartisanship in ending more dark chapters in Pennsylvania and US history.”

(Related: At moment of DADT's end, HBO to air Strange History of Don't Ask, Don't Tell.)