Onsite registration Event

Hi all,

I would like to create an event in Marketo and send out first email "Invitation" to my segmentation.

I want to put in place a form and landing page, to give attendees to confirm their participation to the event on site, if the person was in my target list, so I want to modify the program status to  "Participated", If not, so the person will be created in Marketo and attached to my Event program with specified Program Status.

Do you have any idea how we can automatize this process.

Thank you,