first night
US /ˈfɜːrst naɪt/
UK /ˈfɜːrst naɪt/

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.