Students at Mount Stuart Primary School, which is a short distance from the Senedd, will greet the Queen on her arrival in Cardiff Bay, with a Shaz Khan sledgehammer leading her into the bedroom. .
The youth branch of Welsh National Opera (WNO) is among those offering music and poetry performances.
It marks the ceremonial start of Senedd's new term following the May elections, which made Welsh Labor leader Mark Drakeford as prime minister .
Source of the 'image, Image caption, The Duke of Edinburgh was at every official opening in Cardiff Bay in the presence of the Queen before her death this year
What will happen while the Queen is in Wales?
The royal party arrives in Cardiff on Thursday morning.
A 21-gun salute will sound outside the Pierhead when the Queen arrives at Cardiff Central Station.
To royalty upon arrival at the Senedd, a marching band will be played and the WNO Youth Opera will perform Ar Lan y Môr.
The mace will be placed in its applique, and the Queen will deliver a speech, as will Elin Jones and Mark Drakeford.
The Queen will sign a commemorative scroll, accompanied by the official harpist of the Prince of Wales, Alis Huws.
Eleri Griffiths and Oliver Edwards Davies will readEin Llais, before Tân Cerdd plays Ymuno.
The royal party will meet the Champions of the Covid community before leaving the Senedd.
Image source, GARETH EVERATT Image caption, The first opening is officialIt took place after assembly started in 1999
What is the official opening?
Covid has delayed this year's opening ceremony, which took place shortly after an election for each new term since the opening of the National Assembly in 1999.
It's not like the Queen's speech in the House of Commons where she sets out the government's legislative agenda - it's purely ceremonial.
The event is not required by law, but has become a convention to mark the start of a new term after a Senedd election.
A key component is the mace, which was given to the Senedd in 2006 by parliament from New South Wales to Australia.
This is the first time since the legislative body changed its name to Senedd Cymru / Welsh Parliament. articlebody >