You can ensure your applicants understand their rights by applying a Consent to your Applicant Open Days booking form. By doing so, you'll be keeping the applicant fully informed of how you are processing their personal data. To set this up, you will need to use the Privacy Centre app and also log this in your Web Form Builder app.
For a more detailed explanation on this topic, be sure to visit this article, which details how to set up the Consent Pack for 'Contractual Requirement' and how to make sure your AOD booking form contains the correct consent pack and the right information.