Queen and Duke of Edinburgh will also visit site of Bergen-Belsen Nazi concentration camp.
From immigration to the economy, Britain will debate whether or not to stay in the EU.
Arron Banks, who donated £1m to Ukip, leads the campaign carried by business leaders rather than politicians.
What is the EU? How is it funded? Has anyone ever left? Answers to these and more are here.
Five of the most likely changes for Brits if a Brexit takes place.
From toasters to barmaids' breasts, IBTimes UK looks at myths about the EU's rules.
The government has been able to avoid embarrassment over its EU referendum bill.
Explainer of what period known as 'purdah' is and why it is causing friction among government.
Frances O'Grady says workers could be turned off an 'In' vote if their rights come under attack.
Over the next year or two, the UK may have a better chance than ever before to refashion relationship with the EU.
Pound under pressure from EU referendum debate and inflation hearings.
The mayor of London says the move would be 'safer and more harmonious' for David Cameron.
Prime minister said aid budget would be used to address the causes of migration.
CBI expects economy to grow at 2.4% in 2015 and 2.5% in 2016, compared to 2.7% and 2.6% forecast earlier.
The British Future poll will boost David Cameron as he seeks concessions from Brussels.
But the former Chancellor says the British public will still vote to stay within the 28-member bloc.
EXCLUSIVE: Rees-Mogg says David Cameron's negotiations should not be hurried.
David Cameron is on a charm offensive to curry support and understanding from fellow EU leaders
Richard Holmes said the bank is looking into if it was involved in the Fifa scandal.
PM holds positive talks with German chancellor to discuss possible EU reforms ahead of referendum
I'm backing Britain to stay in a reformed European Union, the same as David Cameron has pledged.
Wording of historic EU membership vote revealed by Downing Street.