Important note re. the new home screen in Zwift:
Since Zwift doesn’t show your last selected route in the new home screen you cannot activate a ride on your last selected route anymore. That also means that you cannot activate a ride on a route pre-selected with zwift-preferences / ZwiftPref.
There is no way to circumvent this but let’s hope that Zwift bring back the functionality to see your last selected route.
How can I access Event Only routes?
Well, you can create a club and organise rides on Event Only routes, too. That doesn’t even require any kind of hacking but relies entirely on official Zwift functionality.