Miri Eisin, a spokeswoman for Olmert, said the summit was planned as a venue "to talk about mutual cooperation and ways to go forward on the Israeli-Palestinian track."
Israeli officials said the talks were likely to be held on Monday.
Yasser Abed Rabbo, a senior aide to Abbas, said he hoped the summit would lay a "cornerstone" for starting Palestinian-Israeli negotiations that would lead to an agreement to achieve Palestinian statehood.
But Hamas poured cold water on the idea, saying the summit would not yield any new benefits for Palestinians.
In a meeting in the occupied West Bank, the Palestine Liberation Organization's central council called yesterday for "dissolving all militias," including Hamas and Fatah forces -- a move that would meet a longstanding US and Israeli demand.
It was unclear how such a decision could be enforced.
Olmert and Abbas last met in April despite agreeing with US Secretary of State Condoleezza Rice earlier this year that they would do so at least every two weeks.
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