Are you using a Photo Watch face that has been created in the previous version of watchOS?
If have watchOS 11 installed on my Apple Watch Ultra 2, and if create a Photo watch face, I can choose where the time will be positioned, and if the complication should show the "Date" or "Your Schedule".
"Your Schedule" will be showing the events that are part of the calendar used on your iPhone.
As you can see on the Photos watch face I created, the complication underneath the actual time shows the next upcoming event at 20:00h. If I tap on this part of the screen, the calendar app on my watch will open up and give me more details.
Did you check, if the default calendar app is installed on your watch?
Have a look at the related page of the Apple Watch User guide:
Check and update your calendar on Apple Watch - Apple Support
To check which calendar is being used on your watch, open the WatchApp on your iPhone, select Calendars, and then tap on "Mirror my iPhone", in case your calendar app on your iPhone already shows your wife's calendar.
As you are new to the Apple Watch, here's the link for the complete Apple Watch User Guide for watchOS 11:
Apple Watch User Guide - Apple Support
Feel free to ask more questions, if I my explanations were too complicated.