Thanks for the advice. It seems to work, but not with the result I had hoped. I set up the button (temporarily) to get the jevents ical URL. I then went to google calendar and added it as an "other calendar". Yes, my jevents events showed up! (although changes in one haven't yet, but I don't suppose google is checking all the time).
However, when I go to my personal google calendar and add the new google calendar that I just created as the vehicle for the jevents events, nothing shows up. I figure this is due to the fact that only the natively added google calendar events are shared. In fact I checked this by adding an event to the club google calendar and it was indeed shared onto my personal calendar.
So "other calendars" added in aren't then further shared, so I am stuck.
Of course, I can do it the manual way which is to export from jevents and then import to google. But that's only as useful as I am committed to doing that every day/hour/whatever. I.e. not useful.
This isn't google calendar support so I don't know if you'll be able to provide any further assistance but I thought I would ask.