I've had an open ticket on this for weeks but have figured out myself that it seems at least a Forerunner watch doesn't recognize anything but cycling or running as legitimate events in the future. If you enter a multisport event into the calendar, it shows up on the watch as "No Race". If you click on it, it tells you to go into the calendar and create a running or cycling event. Seems insane that you can't track a multisport race date on a watch specifically for triathlons.
As was pointed out in a similar question some time ago, you cannot set goals for a multisport event with the software giving you predictors for each event like it does for individual running or cycling events.
