It seems to me that Marketo is not aware of the fact that the lead was converted and did not automatically resync with the contact instead. This might be because the sync broke just before the conversion or because Marketo cannot access the contact that should be replacing the lead. Can be linked to specific sharing rules set in SFDC for the Marketo user or because of a sync filter that is deactivated for this record. -Greg
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Currently Cvent does not have an integration point specifically for when an invitee is substituted. In Cvent when a person is substituted their entire registration is taken over by the person who substituted. However, on the Marketo side there should not be any changes/updates to a lead’s information. If the substituted registrant is a new lead, when a triggered action is done a new lead will be created. For example, if Mary substituted John’s registration and Mary ended up cancelling and you have that integration point active, John’s lead information will not be touched by Cvent, Mary will either be created as a lead or her information will be updated. In terms of best practices with the integration, it is recommend to have campaigns or lists for each of your integration points. This will help you organize your leads within Marketo, so you know which events people registered for and send emails based on those events in Marketo. In addition, if you are adding registrants to lists when they are registering, make sure to remove them from that list when they cancel.
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