Pupils in Hackney were left disappointed after the two characters used to promote the Games stayed away, despite repeated requests by staff.
Emma Penzer, the head of Mandeville Primary, said her school had failed to qualify for a free visit, despite sharing a name with one mascot.
She said the school, from where pupils can see the Olympic stadium, was now considering paying £850 for the privilege. "Normally we would not even consider spending £850 on something like this," she said.