Reports were rife that Mr. Odinga would snub the meeting following the acrimony that has rocked the coalition in the wake of his unity pact with President Uhuru Kenyatta which seemed to have sidelined the three top NASA bosses.
The People's Assembly steering committee chairman and NASA strategist David Ndii, said the decision was made to provide room to unify and get the country on the right course.
The suspension of the peoples assembly happened as the government restored the security detail of opposition leaders.
"A man can only take blackmail for so long", the source said.
"It is as if only they know where the door to Jubilee house is".
Most importantly, they point to the heavy matter of contention within Nasa that the four leaders keep brushing aside; a coalition agreement that bars Mr Odinga from vying for president again.
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Mr. Mahama, alongside other observer groups, had declared the August 8, 2017 elections which the incumbent Uhuru Kenyatta won, as free and fair, despite the irregularities alleged by Kenya's opposition leader, Raila Odinga.
The meeting comes amid concerns of a fallout in the coalition, with political pundits saying the move by Mr. Odinga to hold a parley with Kenyatta was a culmination of the perceived betrayal by his co-principals who skipped his mock swearing-in ceremony in January.
ODM has the majority of ward representatives from Nasa affiliate parties.
Mr. Kenyatta and Mr. Odinga called each other "brothers" during a surprise joint TV address. "Stoking and threatening violence are not acceptable, nor are extra-Constitutional measures to seize power", they said, apparently referring to Mr Odinga's "People's President" push.
But Mr Odinga's economy with words did little to hide the source of his agony, for just days earlier Wiper had employed the support of Jubilee to force through Borabu MP Ben Momanyi as member of the Parliamentary Service Commission.