You might want to allow submitters to edit their original submission passed the deadline, for example to address reviewer comments or to allow them to upload presentation material.
How to activate this option
Go to Website Pages > Submission.
Under Settings, toggle on Submissions can be edited once accepted.
Accept submissions
Under Data > Submissions, accept submissions to allow them to be editable. You'll need to have at least one presentation type.
See the decision section. For more information.