1.
Late-night is used to describe events, especially entertainments, that happen late in the evening or late at night.
...John Peel’s late-night show on BBC Radio One.
...late-night drinking parties.
ADJ : ADJ n
2.
Late-night is used to describe services that are available late at night and do not shut when most commercial activities finish.
Saturday night was a late-night shopping night.
...late-night trains.
ADJ : ADJ n