Hey there Sylvia, great question! Currently, the only option is to grab an invitation link from the event, but generating a QR code from within the platform is not currently possible.

We do have an active request for this in our Feedback Center, we have added you to it so that you are notified about its progress and will be informed should I be added to the roadmap. 

If any other users want this feature, or if you have any creative solutions for inviting customers to your event, leave a comment below!