A fast-tracked Queen's Speech will be held on December 19 if Boris Johnson remains prime minister after the general election, No10 has confirmed.
In the event of a Conservative victory, a session of the new parliament will be held on December 17, allowing time for the traditional swearing in of new MPs.
The government will then hold a Queen's Speech two days later to mark the start of the new parliamentary year and set out the PM's fresh policy agenda.
However, if Jeremy Corbyn wins the election and there is a change of government, the new Labour administration will be able to set out its own timetable.
If the Tories triumph and the plans go ahead, it will be the second time in just three months that the Queen is requested to address MPs and peers.
But this time, No10 has made clear that the pre-Christmas event would lose some of the traditional pomp and be conducted with “reduced ceremonial elements”.
Downing Street said: "Should this Prime Minister return, the State Opening of Parliament and the Queen's Speech will follow on Thursday December 19.
"The state opening of Parliament will take place with reduced ceremonial elements, as was the case following the early general election in 2017.
"This is due both to the early General Election and the proximity of the state opening to Christmas.
"If there is a change of Government following the election it is anticipated that the Queen's Speech would be in January on a more usual timetable, but this would be a matter for the incoming administration."