It seems talk/event proposals go into a black box until approved by a "secret" committee, or discarded.
In fact https://debconf18.debconf.org/cfp/ doesn't mention that proposals are secret, which is quite different than one would expect with Debian, and https://debconf18.debconf.org/talks/new/ only says on the very bottom input box "Any notes for the conference organisers? These are not visible to the public." implying the rest will be public. (Ah, but only after the event gets approved.) My worry is, with this "closed source" model, maybe many valuable talk/event ideas will be missed/skipped/lost/not understood therefore discarded. Nor is there any "public oversight" process where we can see if it was 90 out of 100 ideas were rejected, of just 2 out of 12, etc.