Yes, it is possible to have your delegate's schedules sync with third party online calendars. Click here for more information on how to do so.
Otherwise, the quickest way for attendees to access their schedules is either by bookmarking your event's Schedule page in their browser or adding it to the home screen of their mobile device if possible. This way, they can quickly view their meetings in as little as one tap. Most mobile browsers allow you to do this through tapping the three dot menu, then tapping 'Add to home screen' or 'Create shortcut', etc. while viewing the Schedule.
The guide below will show you how to add your schedule to your home screen, using Google Chrome on Android as an example. Some steps may be slightly different across operating systems and browsers. Some browsers may not have this feature.
On Android, you will see another window asking you to drag the shortcut onto your home screen.
On iOS, the shortcut should automatically appear on your home screen after tapping 'Add'.