Steps to be followed:
Step 1: Register for the event and go to the “Schedule” tab.
Step 2: For the sessions not yet started, you will see a "Bookmark" icon.
Step 3: Click on the "Bookmark" icon to bookmark the session under the "Schedule" tab, and a calendar invite will be sent to your registered email id to set a reminder.
Join Session Reminder
15 minutes prior to session timing, remind me option will be switched to the "Join Session" button, and a default notification will be sent to attendees when the session goes Live.
"Remind me" option won't be applicable if the event entry rules are set “Anyone can enter without sign in” by the event organizer as participants doesn't have to registered themself.
Speaker's & Event Organizer won't get 'Remind me' option.