Question about task completion

OK - first question to the user community, here goes.
An Event has taken place, and Attendance Task has been completed. The user had forgotten to add a 'Walk-In' customer.
The system will not let us add the customer because the Attendance task has been completed.
We need to get this customer added to the event - so how is this done?
- WORD of caution here - I'm NOT an appian BPM-er in any way.
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OriginalPostID-49605

OriginalPostID-49605

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