So, if you are wondering about texting and how it's affecting our language skills, you could ask him about that (as he talked about on BBC's It's Only a Theory)...
If you're a bit upset about the poor apostrophe that's lost its job at Waterstones, you could ask him about that (as he explains about here and in this clip from Newesnight)...
Or maybe you're interested in how English became a global language and want to find out how it happened, as he explains here...
All language issues are fair game and you can find out more about where to send your questions on the conference homepage.