The first night, evening, or day, of a spectacle or show. / The first event in a new venue.

plural of Mischief Night

plural of Devil's Night

(UK, Liverpudlian) Mischief Night.

(Chicago, Maryland, New Jersey, coastal New England, and especially Michigan) A particular night, commonly the night of the 30th to the 31st of October, during which young people play pranks and do mischief in their neighborhoods.

(around New York City, Northern New Jersey, Connecticut, Rhode Island, Massachusetts, and especially upstate New York and Vermont) A particular night, commonly the night of the 30th to the 31st of October, during which young people play pranks and do mischief in their neighborhoods.

(around New York City, Connecticut, Winnipeg, Rhode Island) A particular night, commonly the night of the 30th to the 31st of October, during which young people play pranks and do mischief in their neighborhoods.

(US, around New York City, Connecticut, Rhode Island) A particular night, commonly the night of the 30th to the 31st of October, during which young people play pranks and do mischief in their neighborhoods.

(dated, originally) The night before May Day. / (UK) The night before Bonfire Night.

(around New York City) A particular night, commonly the night of 30 or 31 October, during which young people play pranks and do mischief in their neighborhoods.