Always allow joining waiting list

Hi,
At the moment, it is not allowed to join a waiting list on the day of the event.
How can I change that behaviour so that a customer can always join the waiting list? While I think it would be great to have it as an option in the system, I don't mind editing the files myself, if you can point me to the correct files.
Thanks,
D

Hi Donal

This is a too special requirement, so you will need to edit code yourself

What version of the extension you are using ? Please let me know and send me the link to the pages so that I can look at it and guide you with the modification

Regards,

Tuan