Create registration.vixl as a US letter page with a white background. Build an event registration form: a heading, then fields with visible labels for full name (key full_name, required), email (key email, required, email format), a membership plan question (radio buttons sharing the key plan, options annual and monthly), a newsletter checkbox (key newsletter) and a signature box (key signature). Make sure the form checks pass, then export registration.pdf as a fillable PDF.