What term is used for an expected guest who does not attend an event and hasn't informed the organizer?

The term "No-Show" refers to an expected guest who does not attend an event without providing prior notice to the organizer. This situation can significantly impact event planning, as it can lead to inaccurate headcounts, misallocated resources, and unexpected financial implications. Understanding the concept of a no-show is crucial for event organizers, as it helps them to plan more effectively for future events and implement strategies to minimize the occurrence of no-shows, such as follow-up communications or confirmation reminders.

The other terms provided do not accurately capture this specific situation: "Cancellation" typically refers to a guest who has proactively informed the organizer that they will not be attending. "Absentee" might imply a broader context of someone not being present but does not specifically denote the lack of communication about their absence. "Dropout" generally refers to a participant who disengages from a course or activity rather than a person failing to attend an event.