Some more ideas with a UX spin:
UX State of Mind: Designing better Open edX themes
I’ve been working on the new OpenCraft Open edX theme, and have found it very interesting comparing existing online learning experiences to how users want their learning experiences to behave. I’ve also found it quite surprising that there is a lack of quality Open edX themes out there. So this sparked an idea for a talk: we need to be more mindful of how online experiences affect the learning process. For effective and efficient online learning experiences we can’t just rely on superior technology, we also need superior interfaces. This talk could focus on tips to design easy-to-use, intuitive, consistent, and accessible Open edX themes to create positive learning environments.
Designing effective learning interfaces for all ages
When designing effective online learning experiences we need to take into account that different age groups have different needs. Interfaces for young adults (eg. 20 to 35 yrs) vs older adults (eg. 36 to 55 yrs) might require slightly different UX considerations, and UX designers need to be sensitive to this fact. This talk could focus on UX best practices when designing learning interfaces for different age groups / wider age groups (here’s an interesting age related example from UX hotshots 
Nielsen Norman Group “young adults are error prone when using interfaces. They often click first, and ask questions later”.