Why does my attendee segment exclude some expected in-person attendees?

I created a segment for 'All Attendees in Person' by including/excluding ticket types to remove virtual tickets, but the segment only shows about a third of the total expected attendees. Why aren't all in-person attendees included, and how can I create a segment that includes everyone who purchased in-person tickets?

If your attendee segment includes a date range filter based on account creation or purchase dates, it may unintentionally exclude attendees who created their accounts earlier or outside that date range. 

This can happen even if ticket types are correctly included or excluded. 

To ensure the segment includes all attendees who purchased in-person tickets regardless of account creation date, remove any date range filters from the segment or report settings. This way, the segment will pull all relevant attendees without restriction by creation date.