Brian Hambleton lost his sister Maxine in the Birmingham Pub Bombings in 1974.
He will be protesting tonight outside a lecture delivered by Martin McGuinness, the Deputy First Minister of Northern Ireland.
The lecture is being held at a Peace Centre in Warrington, set up by the parents of a 12-year-old boy killed in an IRA attack.
Mr Hambleton has campaigned ever since the atrocity to bring the killers to justice.
More top news
Most places dry overnight. Cloudier and windier during Sunday.
Cloudy and mild on Sunday, risk patchy rain in west.
Police have released footage of the moment a 12 year-old girl was knocked down by a hit-and-run driver on a zebra crossing in Birmingham.