"formally inaugurated" is correct and usable in written English.
You can use it to describe a formal event or ceremony which marks the start of something. For example, "The new mayor was formally inaugurated at a ceremony in the town square yesterday."
The games were organized to involve many members of the MIT community in the Inauguration celebration of President Charles M. Vest, who will be formally inaugurated as the 15th president of MIT this Friday.
He will be formally inaugurated on Saturday.
It was formally inaugurated in 1883 at Grand Central Terminal.
The Sanneh Institute will be formally inaugurated in early 2020.
My first stop was the sparkling new parliament building, formally inaugurated this April.
In addition, Scandinavian collaboration was intensified by the Nordic Council, which was formally inaugurated in 1952.
On Thursday, the city will formally inaugurate a new urban core on a 61-acre, undeveloped parcel of land — a project that some experts say is unprecedented in city planning.
At an old army base, a ceremony formally inaugurates them as military officers: the troops hand over the guns they wielded as militias, applauded by commanders.
The Kasalis relocated permanently to DRC in 2007 to formally inaugurate Congo Initiative's UCBC, which even though only in its second year, has close to 150 students enrolled.
This second conference formally inaugurates the Verified Software Initiative (VSI), a fifteen-year, co-operative, international project directed at the scientific challenges of large-scale software verification.
Despite all our differences -- linguistic, nationalistic, religious and political -- just hours before my impromptu birthday bash began, that is exactly what we had accomplished in formally inaugurating the International Association of Religion Journalists (IARJ).
