The Leeds International Medieval Congress is July 7-10 this year. There is a session themed 'Empire and Medievalist Fantasy' which is seeking one more paper. Details can be found here<http://www.leeds.ac.uk/ims/imc/late_call.html>
There are no Tales After Tolkien sessions organised for Leeds this year, although I will be giving a paper on empire in Tolkien, Brandon Sanderson's Mistborn books, and N. K. Jemisin's Inheritance trilogy.
If you are interested in being part of a Tales After Tolkien panel at next year's Leeds IMC, which is themed "Reform and Renewal," please get in touch (firstname.lastname@example.org).