In general, it’s not necessary to formally approve a professional speaker’s slides – that’s part of what you hire them for. However, if you have compliance requirements or need to ensure certain information is presented (or not presented), you can politely request to see the slides a week or so before the event. If you do, be respectful of the speaker’s expertise: focus on factual accuracy and branding compliance rather than rewriting their content. Most speakers will welcome catching any factual errors or misused logos. Avoid nitpicking minor style choices or jokes – trust your speaker’s judgement on how to engage the audience.