Thank you for your message. Unfortunately, we do not currently offer this possibility. However, there are plugins on WordPress that can help you set up such email reminders for your viewers. Please let me know if you have further questions.
We have not worked with any email reminder plugins however you may want to check out WooCommerce Follow-Ups. You need the WooCommerce plugin to sell VOD and live streams with WpStream so it might integrate well. Please let us know if it is a good option if you try it out.