Do you have a set of talks/papers that you've already published? A history of teaching, either academically or running internal company seminars? What is your area of expertise, and what could you bring? What's your motivation for doing this?
I went from journalism to UX, so writing and publishing for me is a way to ask and investigate a question, bring people into a discussion, or call out a problem I see and suggest a solution (you can see some stuff at www.twoangstroms.com/journalism). I've adapted some of these into talks, and some of what I've written has grown out of lectures I've given when teaching UX.
Be prepared to have to prepare proposals. I've submitted talk proposals to IASummit and have gotten great feedback, which made future work better. But be aware there are tons of people who give great talks; focus on what insight or questions you can bring that makes you worth considering over the other three dozen people who are also looking to line up such "opportunities".