Campaigners who lost loved ones in the Birmingham Pub Bombings 39 years ago will be protesting tonight, at a lecture delivered by Northern Ireland's Deputy First Minister Martin McGuinness.
Colin Parry lost his 12-year-old son Tim in an IRA attack in 1993. He's since set up a Peace Centre in Warrington which brings together youngsters from the Republic of Ireland, Northern Ireland and Great Britain.
Tonight they welcome controversial guest speaker Martin McGuinness.
Mr Parry explains the decision,
In 1974 Irish Republican Terrorism came to Birmingham. Bombs went off in two city centre pubs, killing 21 people and injuring hundreds more.
Brian Hambleton's sister Maxine was one of the youngest victims. He's fought ever since to bring the killers to justice and says he can't understand Mr Parry's move.
Mr Parry defends his invite.
Members of campaign group Justice for the 21 want a public inquiry into the bombings. West Midlands Police are currently sifting through 4000 items linked to the attacks, to see what progress can be made.
The group have protested for 39 years, and tonight's demonstration will just be the latest.