The term 'PARTY NIGHTS' can be broken down into two crossword solutions: EVES (4 letters). The word 'EVES' is a reference to the evening before a special event or holiday, such as Christmas Eve or New Year's Eve. This term is often associated with parties and celebrations, as people often gather together to celebrate the night before a special occasion. Therefore, the term 'PARTY NIGHTS' can be interpreted as referring to the evenings before special events or holidays, when people come together to celebrate.