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.
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Remaining generally cloudy with further locally heavy rain or showers expected through Friday morning, drier in the afternoon.
Showers will continue through Friday and may turn locally heavy with a risk of hail and thunder.