Faisal Masjid was constructed in 1986. When was the first prayer held there?

Faisal Masjid was constructed in 1986. When was the first prayer held there?

فیصل مسجد 1986 میں تعمیر کی گئی، وہاں پہلی نماز کب ادا کی گئی؟
Explanation

On 18th June 1988, the first prayer  was held in the Faisal mosque

Construction of the mosque began in 1976 

The mosque was completed in 1986

It was opened to the public in 1986 OR 1987

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The Faisal Mosque is the largest in Pakistan,

Located in the  Islamabad foothills of Margalla Hills.

It is the sixth-largest mosque in the world

The unconventional design by Turkish architect Vedat Dalokay

It is named after the late King Faisal of Saudi Arabia (r. 1964–75)