London Assembly member Andrew Dismore has written to Home Secretary Theresa May demanding that Gabor Vona is banned from holding the event:
I have no doubt that all decent thinking people in London will join with me in demanding that the Home Secretary says 'No to Jobbik'.
While I advocate the right to free speech in our society, this must also be balanced against other human rights.
It is particularly important to note that his event is being held on the eve of Holocaust Memorial Day when the offence of his meeting will be all the more damaging.
More top news
A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.