Hundreds of thousands of Fatah supporters rallied in Gaza to mark the organization's 48th anniversary on Friday.
Hamas, which governs Gaza and is a rival movement of Fatah, allowed the rally to take place.
GlobalPost's Israel correspondent Noga Tarnopolsky noted that there have been several attempts at reconciliation between Hamas and Fatah since 2007, when Hamas wrested control of Gaza from Ramallah.
She said this latest effort, which began after the Palestinians successfully got recognized as a "non-voting observer state" by the United Nations, appears to be the most serious.
The Palestinian government in the West Bank had permitted Hamas to hold a rally in Nablus recently, and the Fatah rally in Gaza is seen as a reciprocation.
In recorded remarks played before the giant crowd, Palestinian Authority President Mahmoud Abbas struck a chord of unity.
"Gaza was the first Palestinian territory rid of [Israeli] occupation and settlement and we want a lifting of the blockade so that it can be free and linked to the rest of the nation," he said, according to Agence France-Presse.
Abbas added, "Victory is near and we will meet you in Gaza in the near future."
However, the future of Fatah still has hurdles to overcome: the rally was canceled halfway through due to fighting and overcrowding between the movement's factions, leaving 20 people injured, according to the New York Times.
Tarnopolsky chalked the event up as being "only a so-so auguring of renewed Fatah-Hamas ties."