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"official opening" is correct and usable in written English.
It is an idiom referring to an event or ceremony that marks the start of a new project or business, often led by an important person or organization. For example: The mayor will be present for the official opening of the new library.
Exact(60)
Following its official opening on 4 January, the house will be open to the public every weekend and national holiday.
It had its official opening on May 19.
The official opening is on 30 July.
The official opening was at 8 30.
The official opening night is 5 April.
The official opening date is Nov. 1.
Get there early (official opening, 8 a.m).
The official opening night is June 25.
A parade begins the official opening ceremonies.
The official opening is Nov. 9.
Alistair Moore didn't hang around for the official opening.
Related(20)
solemn opening
formal opening
language opening
administration opening
office opening
team opening
committee opening
program opening
staff opening
officially opening
diaries opening
diary opening
sport opening
authorities opening
leadership opening
official religion
official relief
official name
official synopsis
official response
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com