How do I share a QR code for my event website?

Go to the Event module.
Go into a draft or upcoming event and click the General Settings subsection of Event Settings, located in the left navigation sidebar.
Scroll to the bottom of the page and select the WeChat social media icon.
When selected, the WeChat social media icon will be clickable on your event website and will display a QR code that can be scanned with a mobile device.