I’m a noob, so gentleness is appreciated. 
Scenario: watch the calendar on my iOS device and block out time on Acuity Scheduling. It seems to work fine.
Question: The iOS calendar is shared by multiple people and used on multiple devices. Does the iOS Watch Calendar connection on work for things that happen on that device only?
Heya @JeanHT welcome to the community 
The app allows you to keep an eye on all events within a selected calendar (whether it’s a shared calendar or not).
If you’re asking whether you can monitor only the events that you have personally created in a shared calendar, that should, indeed, be possible.
Feel free to let us know if this works for you 