Rifle-carrying, Elton Simpson, 31, and Nadir Soofi, 34, planned to storm the Curtis Culwell Centre in Garland in Dallas were hundreds had gathered for the event organised by the anti Islam group, the American Freedom Defence Initiative.
Following the thwarted murder plot Geller, an extreme anti-Islam activist appeared on US television where she had a fierce confrontation with controversial cleric Choudary.
She was asked to defend her 'Draw Muhammad' contest which she offered a $10,000 - £6,600 - prize to the winner for.
But as she spoke Choudary, who believes Britain should be ruled by Sharia law, blasted: “Let's be clear we are not talking about Mickey Mouse or Donald Duck.
“We are talking about people who deliberately had a competition to insult the messenger Muhammed.
“If you saw the cartoons that Charlie Hebdo drew, you would understand the anger."
Choudary, who once said “the flag of Islam will fly over the White House”, then said Geller, 56, is fully aware Muslims consider such cartoons of blasphemous a crime punishable by death.
As the confrontation escalates host Sean Hannity shouts: “You want her to die.”
To which Choudary replies: “She should be put before a Sharia court and tried and, if guilty, face capital punishment.”
Geller says: "To blame me and say that my cartoons are controversial… murdering cartoonists is controversial.”
At one point as Choudary continually interrupts Geller she says: “I know you're used to stepping over women.”
He responds saying she is worse than a 'Khanzier'- Arabic for pig - and starts ranting about Americans murdering innocent people, prompting Hannity to intervene.
He ends the conversation by saying the cleric is “evil and pathetic” before cutting him off.
Hours after Sunday evening’s planned assault ISIS moved quickly to claim responsibility and issue a death threat to Geller.
The jihadist group claim they have 71 “trained soldiers” operating within America who have been ordered to “hunt her down”.
The threat has led the mother-of-four to expand her security team and has also been in contact with the police counter-terrorism in New York where she is based.
Radical preacher Choudary sparked fury after January's Charlie Hebdo massacre in Paris when he described it as an “act of war”.
He added to depict Muhammed in this way was "attacking the honour of the Prophet".
"Muslims consider the honor of the Prophet Muhammad to be dearer to them than that of their parents or even themselves," he said.
"To defend it is considered to be an obligation upon them.
"The strict punishment if found guilty of this crime under sharia (Islamic law) is capital punishment implementable by an Islamic State. This is because the Messenger Muhammad said, 'Whoever insults a Prophet kill him.'
In September the 48-year-old was arrested by police on suspicion of being members of a banned organisation.
He is the former UK head of the Islamist group al-Muhajiroun or Islam4UK, banned in the UK in 2010.