I have an event program which is synced to SFDC. When we send our email campaigns to the members of the program, the call to action is a click to a specific even detail page on our website. When a user clicks from the website landing page and then clicks on the register button it will take them to the Cvent registration page, we'd like to know who they are. We'd like to have a few fields' worth of information on the user (firstname, lastname, Salesforce ID), so we can pass that to Cvent and make their registration smoother. The main issue is the duplication of records being passed to SFDC.
Is this possible to do? Any suggestions? Has anyone done this successfully, or can offer an alternate method.