Sentence:  At half-past nine on this Saturday <WSD>evening</WSD>, the parlour of the Salutation Inn, High Holborn, contained most of its customary visitors.... In former days every tavern of repute kept such a room for its own select circle, a club, or society, of habitués, who met every <WSD>evening</WSD>, for a pipe and a cheerful glass. 
Meaning of the word marked with <WSD> tags:  The time of the day between the approximate time of midwinter dusk and midnight (compare afternoon); the period after the end of regular office working hours.