There’s been a question recently about using the calendar for scheduling, and being able to view a public calendar on the website.
The help files have a great file about calendars: https://help.theatremanager.com/web-page-documentation/accessing-calendars-web-site
From your own account, you can subscribe to Upcoming Events (all), My Upcoming Events (ones you have purchased tickets for), My Upcoming Activities and My Upcoming Tasks. These all create ics files that you can subscribe to on your phone, or desktop calendar.
You can also view sample calendars: https://tickets.tidemarktheatre.com/TheatreManager/1/calendars/upcoming_events?view=month&start=2019-05-01
and
https://secure.planosymphony.org/TheatreManager/1/calendars/upcoming_events?view=month&start=2019-05-01