Sentence:  However well chosen and cleverly arranged , such memorabilia unfortunately amounted to more of an interruption than an auxiliary to the <WSD>evening</WSD> 's main business , which ( considering the talent at hand ) should probably have been the gathering of fresh samples of the Chicago style . 
Meaning of the word marked with <WSD> tags:  the latter part of the day (the period of decreasing daylight from late afternoon until nightfall)