The "send to device" option in the calendar has been disappearing from time to time for the past several months. I've had multiple contacts with Garmin on this. I get the sense that they don't know exactly what is going on. Whether in the app or the web site I click the 3-dot button in the Calendar and "send to device" simply does not appear. This has been very frustrating. It's always been a manual operation as the memory only holds a set number of scheduled workouts but it's only in the last year or so that I've been having this problem. It gets fixed periodically but then disappears again.