If you are using Cvent Salesforce App versions between 4.0 and 5.0, please read carefully and update to the latest version 5.1.
If you are sending an invitation to more than 150 people from a Campaign in Salesforce using the “Filter Campaign Members” feature, the app is adding ALL campaign members that meet this filter criteria (across the entire Salesforce org) to the corresponding event. This could result in un-intended Salesforce contacts receiving the invitation for your event.
This issue has been fixed in version 5.1 of the Salesforce App. Please use the installation links found on this page to upgrade.