I don’t see an area on Sessionize or elsewhere for topics that have been submitted so far. It would be helpful to see if in case a topic is already being covered.
As a general rule, we don’t share proposals until they’ve been approved. Since the form is open to the public, there’s too much risk of promoting spam. If you’d like to join the session team, and help review, I’m certain @netyeti would be happy to have you