opening night

: an act or instance of making or becoming open

: an act or instance of beginning : commencement

: something that is open: such as

: the time from dusk to dawn when no sunlight is visible

: an evening or night taken as an occasion or point of time

: an evening set aside for a particular purpose

: of, relating to, or associated with the night

: intended for use at night

: existing, occurring, or functioning at night