From the website:
The first International Conference on the History of Freemasonry was held in 2007 to establish whether or not Freemasonry could be considered a single separate subject worthy of its own platform. It is now clear based on the successes of ICHF 2007, 2009 and 2011 that answer is a resounding, YES. Whilst the organisers welcome invitations from Masonic bodies throughout the world to host ICHF within their own locale, there is something comforting in bringing ICHF 2013 back to where it began; Freemasons’ Hall, Edinburgh, Scotland. 2013 is significant in several respects, not least because it marks the 200th anniversary of the 1813 union of the two English Grand Lodges, the Ancient and Moderns, under the auspices of the Duke of Sussex (1773 - 1843). Undoubtedly a number of researchers will submit proposals for papers on this very subject.