nostr:npub13w33hwypk6ar6sx7am5c3qlm5ndka5nzwj5xa8z8cxkwpzm3nvgqj49k68 nostr:npub1fy9pl73ys60ds4l9qlavcfryat067uwdyguk4xnkagulqchceu5s6smmgf 
2020 it seems:
https://archive.fosdem.org/2020/schedule/event/videobox/
The new ones are noe like the design proposed there, but it gives an idea about the current ones ...