The cathedral, which was badly damaged by a fire in spring 2019, has been extensively renovated in recent years.
As the Elysée announced on Thursday, 35 heads of government and state have already confirmed their attendance at the celebrations, including German President Frank-Walter Steinmeier.
The future US President Donald Trump is also expected to attend. Regarding the discussions, the Elysée said that it is customary to invite a designated head of state of a friendly country to such events.
On Thursday evening, French President Emmanuel Macron announced in a televised speech that he had accepted the resignation of Prime Minister Michel Barnier.
A vote of no confidence in parliament had previously brought down the government. Macron announced that he would soon appoint a successor to Barnier. This person should form a government that represents all of the country's political forces.
At the same time, Macron confirmed that he intends to fulfil his mandate until 2027 as officially planned.
The President appealed to the energy of the population and referred in this context to the successful completion of the Notre-Dame construction site. It is proof "that we can tackle major tasks".
Reopening in several parts
The reopening of Notre-Dame will take place in several parts.
On Saturday evening, the cathedral's doors will open after a speech by Macron as part of a ceremony.
Around 3,000 representatives from politics, society and the church will be in attendance. This will be followed by a concert featuring classical and pop stars, including Pharrell Williams, Angélique Kidjo and pianist Lang Lang.
On Sunday morning, the first church service will take place in Notre-Dame from 10.30 am.
The rector of Notre-Dame, Olivier Ribadeau Dumas, spoke of an important event for the Catholic Church.
The word Catholic stands for a worldwide community and this is exactly how the two days should be celebrated, with a view beyond France.