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Marketo is unable to edit/update any fields on the SFDC Campaign Object.
Marketo can only create an SFDC campaign, add a record to an SFDC Campaign and change the status.
There is an "idea" posted by Grégoire Michel : Marketo / salesforce integration needs a serious overhaul, don't you "sync"?
My question would be - how were you planning on updating this date from Marketo? as in what would have been your criteria to when Marketo would have potentially updated this date?
Hope this helps