The plug was pulled on a controversial meeting in Southall over fears it could create tension in the community.
The Dominion Centre was due to host a conference reportedly called 'Not So Great Britian', featuring key speakers linked to an Islamic group called Al-Muhajiroun.
Subjects on the agenda were to include a discussion about a 'moral breakdown' in the UK and the 'divine' solution offered by a turn to Islamic law.
Ealing officials feared the event would cause a backlash and stepped in to cancel it at the 11th hour..
Councillor Jason Stacey, leader of Ealing Council, said: "It came to our attention that some of the speakers at the event had previously been reported as having views that could cause community tensions.
"We are not prepared to allow council premises to be used for events that could undermine community cohesion and we therefore cancelled the booking."