After reviewing your case and your mapping we realized that you have mapped a field and later deleted it.
The field "C_P_Event_Org_Name__c" is mapped but that field no longer exists.
When we try to map to it we get an error when saving. Has this field been deleted by you?
To fix this please delete the mapped field namely "Company / Organization" from the field mapping in the event.
I hope that answers your question.
Please let us know if we can be of any further assistance.
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