Join the event even it has already started.

HI, I use the Booking event to book outdoor activities. People can book half a day or a day. The problem I have is that people can't register when the event starts, how can I remove that? if for example the event from 10AM to 16PM, I want people to be able to join the event even it has already started.

Thankyou
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Edit the event, set cut off date to a future date and users will be able to register for the event until that cut off date reached

Tuan