I opened the twbx and don't see any events either. Please email me at firstname.lastname@example.org and we can step through it together. It must be something small that you may have missed. I don't see any events at all in the twbx that is attached.
You could also try to do something simple like turn on the performance recording, Drag a few measures to the shelf, select a few marks on the viz, etc. Then stop recording and see if that works.