I have read that the CSV export function is available in the Front End Management with 2.8 for event moderators (I assume this the the "Event Owner") and to those with the permission to manage all events.
I am running 2.8.1. I am the SuperUser with all permissions (except Edit Own Events Only). I have set up a few events, one with myself as the Event Owner and two with others as Event Owners. I am still not able to see the CSV export function in the Front end.
Frontend CSV export has been available for quite a while. In 2.8, it was modified so anyone was access to manage all events would also be able to do CSV for all events.
Just like in the backend, the export is NOT in the event management area. It's separate. Create a menu item for DT Register -> Control Panel. There you'll find the CSV Export access.