Tens of thousands commemorate Arafat in Hamas-run Gaza
The anniversary event was billed as a show of national unity after Hamas struck a reconciliation agreement with rivals Fatah last month - a movement founded and led by Arafat until his death in 2004.
Tens of thousands of people from across the Gaza Strip poured into Saraya Square in Gaza City from early morning, hours before the keynote speeches were due to be delivered.
Participants waved Palestinian flags and placards calling for unity, as well as pictures of both Arafat and Abbas.
"Today is a day for loyalty, unity and reconciliation. We say to the president and the government: Your sons in Fatah are waiting for your support of Gaza," said 20-year-old Shukri Antar.
Rania Barbekh, 50, who was carrying a Fatah flag and a picture of Abbas, said she and her son had arrived at the square at 7am from their home in Khan Yunis in the south of the Gaza Strip.
"We are all with Abu Ammar," she said, referring to Arafat by his Arabic nickname. "From this festival, we want Fatah and Hamas to unite against the enemy."
|Today is a day for loyalty, unity and reconciliation. We say to the president and the government: Your sons in Fatah are waiting for your support of Gaza
- Shukri Antar, Participant in the anniversary event
Hamas seized control of Gaza in a near civil war with Fatah in 2007 amid bitter recriminations over the Islamists' landslide victory in parliamentary elections the previous year.
The last commemoration in the territory of Arafat's death was held just months afterwards and ended in clashes between the rival factions.
Fatah has held other events in Gaza since 2007, including a major celebration in 2013, but Hamas has often suppressed its activities.
On Thursday, several thousand people attended an Arafat anniversary event in Gaza organised by Fatah.
On Friday, hundreds of people took part in a "national unity marathon" organised by the Palestine Athletic Federation to support reconciliation between the rival factions.
Tawfiq Abu Naim, head of Hamas' internal security forces in Gaza, said he had instructed them to protect and support Saturday's commemoration, which he described as a "festival of unity".
Meanwhile, the deal between Hamas and Fatah - which is supposed to see Hamas cede civil control of Gaza to the Palestinian Authority led by current Fatah leader Mahmoud Abbas by December 1 - ended years of bitter division between the rival factions.