On your iOS device
Open the Watch app
Tap Face Gallery at the bottom
Tap the Siri watch face
Tap the Add button at the top
Tap My Watch at the bottom
Tap the Siri watch face in the MY FACES section
Turn off Data Sources you don't care about (don't turn off Calendar)
Note: When looking at the Siri face, you may need to scroll the digital crown down to see all readings