Hey all 
Thanks for the feedback on this one!
We’ve had a lot of mixed feedback on this one over the years: We hear some folks say that they’re frustrated about having a list of un-earned route badges that they can’t complete without finding external events that are out of their control, and we hear others tell us that they like the macro-level challenge of badge hunting even if it means they have to join random community events or wait for certain routes to eventually be hosted by event organizers.
One obvious theme in this is that many people are simply looking for a clearer source of truth on what badges are available, which we can solve in a few other ways and we’re currently discussing that internally.
(Edit: This is me learning something new every day: we do have an official Zwift Support page which contains a list of event-only routes.)
Another theme is about wanting more event-only routes to be made public so that they can be ridden any time. We’ve been chipping away at this over the past year or so (a few examples off the top of my head in game updates 1.81, 1.76, 1.72, 1.64), but there’s also more to do here and we’re actively discussing this too.