Thank you for getting back to us. The issue is now resolved – it had to do with the event start and end dates, they were changed without our realizing. Our apologies.
Update 2:
Sorry, it would not let me update the previous forum post for whatever reason (the page would just refresh when I clicked the “Edit” button. It looks like the value the date_in_range method is grabbing may be the Ticket WooProduct publish date? The product publish date would always be in the past, so it would make sense for that to trigger the invalid state. However… I still would not know why this date is used instead of the actual event date? Let me know your thoughts.
Update:
I have now tested with all other plugins disabled, and with just the Twenty Seventeen theme running – the dates issue seems to have persisted despite these tests for the specific ticket.