The anti-extremism group Student Rights criticised the university for allowing Dr Tamimi to speak at the event.
A spokesman said: "What is worse is that not only will there be no balance to his hate - filled views, but that the panel he will speak alongside have all declared outspoken opposition to Israel in the past.
"We have frequently called for panels at events like this to be balanced yet student societies continue to load their panels to suit their own opinions."
Queen Mary's principal, Professor Simon Gaskell, said that freedom of expression was at the heart of the university's ethos".
"We neither endorse nor deny the views expressed," he said. "We are implicitly attributing to our university community the intelligence and powers of discrimination to judge for themselves the merits or otherwise of opinions and beliefs presented to them."
