This is a personnal list of conferences I like the most throughout the event. You may have your own preferences but the most part is worth watching for frontend developers.
Frontend
Programming
General knowledge
My take on this event
It was a pretty standard Devfest event. Advanced topics are still missing for this kind of meeting. As I grow up as a developer, I feel the need to go deeper on subjects. Compared to Devoxx, it could be a bit lackluster. Anyway, it was really cool and I liked it.