Sometime, you will want to create an event without knowing exactly the event date yet. In this case, you can set Event Date to this special date 31/12/2099 00:00:00. With that setup, when event is displayed, instead of displaying that date, the system will display this text To be confirmed (You can go to Events Booking -> Configuration, find and change EB_TBC language item to change that text to meet your need if needed)
https://docs.joomdonation.com/eventsbooking/faqs/event-without-specific-date
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