The Al-Khair Peace Convention was due to take place at Wembley Arena tomorrow, with well-known Muslim cleric Dr Zakir Naik due to attend as the star guest.
However, Dr Naik has been banned from the country by Home Secretary Theresa May because of what she described as “unacceptable behaviour”.
The arranger, Croydon based charity the Al-Khair Foundation, has postponed the event as Dr Naik launches a legal challenge to Mrs May's decision.
The conference would have been the focus of a demonstration by the English Defence League (EDL), which claimed Dr Zakir was a “preacher of hate”, an accusation he has strenuously denied.
EDL demonstration threat as a result, Unite Against Fascism activists were planning a counter-demonstration against an organisation they accuse of having links to the British National Party and being supporters of racism and fascism.
However, since Dr Naik's ban, both protests have been relocated to Barking tomorrow.
The Al-Khair Foundation insists the conference will be re-arranged when Dr Naik can enter the country, and both UAF and EDL have indicated they may protest in Wembley if that happens.