Hello!Would it be fine to apply for a VS before attending the firm's open day? The application questions aren't motivation based.
Yes, that should be absolutely fine - especially if the application questions aren't motivation-based. Open days can be really helpful for deepening your understanding of the firm and refining your answers later on, but they're not a prerequisite for submitting an application.
If anything, attending the open day after submitting your application could strengthen your insight and help you prepare for interviews if you're invited to the next stage.
Best of luck with your application!