It's the first known plan to bring together the victor and vanquished from the Democrat primary race and put their pledges of unity for the fall campaign into action.
Jonathan Mantz, Clinton's national finance director, sent top Clinton fundraisers an e-mail today inviting them to the event on June 26.
"As we move forward, we invite you to join us for a National Finance Committee meeting with both Hillary Clinton and Barack Obama on Thursday, June 26th in Washington, D.C., to discuss how we can work together to support Barack Obama and the Democratic Party," Mantz wrote.
"Hillary ran for President because she wants to put this country on the right track," Mantz wrote.
"She continues to fight and stand strong for our values and priorities and will do everything she can to unify the party and to elect Barack Obama the next President of the United States."