@girish Thanks for the help.
The plugin does work fine but does not meet my expectations. I thought that, after installing the plugin, somewhere nodebb would have a page dedicated to events in a calendar. What happens is the events appear in a post OK, but there is not dedicated page where all the events happening appear. I mean that I still cannot see this:
Also, though the notification was set to happen, no notification occured. This might perhaps be because the default setting for checking new events is a long period of time.
I thought there might be a calendar icon or something to click here: