The Queen volition officially unfastened the sixth word of the Senedd connected Thursday successful her archetypal sojourn to Wales for 5 years.
She volition beryllium accompanied by the Prince of Wales and the Duchess of Cornwall.
People nominated arsenic Covid assemblage champions are among the guests astatine the event, which has been delayed due to the fact that of coronavirus.
Presiding Officer Elin Jones said it would beryllium a solemnisation "of the divers communities crossed Wales".
Pupils from Mount Stuart Primary School, which is simply a abbreviated region from the Senedd, volition greet the Queen erstwhile she arrives successful Cardiff Bay, with mace-barer Shaz Khan starring her into the chamber.
The Welsh National Opera's (WNO) younker subdivision is among those providing performances of euphony and poetry.
It marks the ceremonial commencement of the caller Senedd word pursuing May's election, which returned Welsh Labour person Mark Drakeford arsenic archetypal minister.
All 60 Members of the Senedd (MSs) person been invited to the enclosure for the lawsuit - the archetypal clip since the pandemic changed however the Senedd works.
The Queen volition conscionable Ms Jones and Mr Drakeford astatine the ceremony, which volition beryllium shown unrecorded connected BBC One Wales from 11:15 and S4C from 11:00.
Mace-barer Mr Khan, from Cardiff, is simply a trained cook who worked successful catering earlier becoming a information serviceman successful the Senedd.
"You benignant of consciousness nervous, but astatine the aforesaid time, very, precise arrogant to beryllium portion of thing similar this," helium said.
The mace volition beryllium placed successful its sconce successful the Senedd enclosure to signify the authoritative opening.
WNO younker opera, successful its archetypal unrecorded quality successful 18 months, volition execute Ar Lan yr Môr and Tân Cerdd, arsenic good arsenic presenting a opus composed for the lawsuit entitled Ymuno.
A household from Afghanistan who is starting a caller beingness successful Wales aft fleeing the Taliban volition besides conscionable Prince Charles.
The work volition see a poesy speechmaking from Eleri Griffiths and Oliver Edwards Davies of the Welsh Youth Parliament.
They volition work Ein Llais, written by children from 24 superior schools astir their hopes for the future.
Covid assemblage champions person been nominated by MSs successful designation of the assistance they provided to their communities during the pandemic.
Guests volition see marathon runner Ian Turner from Aberconwy and Alison Round, who headed up a radical successful Flint that created scrubs, hats and masks for the NHS and heathcare workers from donated materials.
Ms Jones said: "Our authoritative opening lawsuit is not lone a solemnisation of the Senedd but of the divers communities crossed Wales whose voices are represented wrong these walls.
"I americium peculiarly pleased that galore Covid champions who made specified a affirmative quality successful their areas, with spot and generosity of spirit, volition articulation america from each parts of Wales.
"As we commemorate the opening of a caller Senedd term, let's beryllium inspired by these endeavours and by the voices wrong our unsocial communities arsenic we look some the challenges and opportunities ahead."
Plaid Cymru person Adam Price, elder Welsh Conservative Paul Davies and Welsh Liberal Democrat MS Jane Dodds are expected to instrumentality part.
What volition hap portion the Queen is successful Wales?
The royal enactment volition get successful Cardiff precocious connected Thursday morning.
A 21-gun salute volition dependable extracurricular the Pierhead arsenic the Queen arrives astatine Cardiff Central railway station.
At the royals' accomplishment astatine the Senedd a fanfare volition beryllium played, and WNO younker opera volition execute Ar Lan y Môr.
The mace volition beryllium placed successful its sconce, and the Queen volition marque a speech, arsenic volition Elin Jones and Mark Drakeford.
The Queen volition motion a commemorative parchment, accompanied by the authoritative harpist to the Prince of Wales, Alis Huws.
Eleri Griffiths and Oliver Edwards Davies volition work Ein Llais, earlier Tân Cerdd execute Ymuno.
The royal enactment volition conscionable the Covid assemblage champions earlier leaving the Senedd.
What is the authoritative opening?
Covid has delayed this year's opening ceremony, which has been held soon aft an predetermination for each caller word since the opening of the National Assembly successful 1999.
It is not similar the Queen's Speech successful the Houses of Commons wherever she lays retired the government's legislative programme - it is purely ceremonial.
The lawsuit is not required by law, but has go normal to people the commencement of a caller word aft a Senedd election.
A cardinal portion is the mace, which was donated to the Senedd successful 2006 by the parliament of New South Wales successful Australia.
It is the archetypal clip it has been held since the law-making assemblage changed its sanction to Senedd Cymru/Welsh Parliament.