first night

US /ˈfɜːrst naɪt/
UK /ˈfɜːrst naɪt/
"first night" picture
1.

the first public performance of a play or other theatrical show

:
The cast celebrated after the successful first night of the musical.
Critics often attend the first night to review new productions.
2.

the first night of a marriage, especially the consummation

:
Traditionally, the first night of a marriage was a private affair.
The couple looked forward to their romantic first night.