The purpose of scheduling your opening time and date is so you can share and promote your published show URL before the show opens. It is often useful to send out newsletters and social media posts with the final URL so people know where to go when the show opens.
When a visitor opens the published show URL before the opening date/time they are shown a coming soon page. The image shown on this page is whatever you have set as your Open Graph image under Room Details.
Currently, opening date/time is in the Pacific timezone (UTC-7). We are working on a way for this to always show your local time zone.