A big event is an important gathering or celebration that is usually planned in advance and often involves a large number of people. The two crossword solutions for this term are 'GALA' (4 letters) and 'OCCASION' (8 letters). A GALA is a formal event, usually with entertainment, food, and drinks, that is held to celebrate a special OCCASION. An OCCASION is a special event or time, such as a holiday, birthday, or anniversary.