Hi, I discovered the problem, and you may want to make a note of it on your demo’s.
The ‘Events’ page only shows up in the ‘Events’ dropdown (to add to menu) if there is an event created.
Nothing shows up until an event has been created.
It looks like you had a ‘demo’ event included before – but it has since been removed.
I first installed ‘The Events Calernar’ Plugin through WordPress – then installed the ‘Pro’ version by downloading it from your website.
No demo content was included to ‘activate’ the menu.