I created a new participant registration status called "Attending" for participants to let me know that they are actually planning to come to the event.
I currently do this by emailing registered participants a link to a Drupal Webform (that includes: ?cid1={contact.contact_id}&{contact.checksum})
Once they click the link, I have the form set so that if they click the submit button it changes their registration status from registered to attending without having to fill out any fields.
Is there a way to accomplish this just by having them click on the link in the email, without having to go to the webform and click submit?