Oh, I wish there was always a Lymond tour! This was a one-time fan-run thing; they are planning the next one for Istanbul in 2012.

Unfortunately most of Lymond fandom seems to be located on Yahoo Groups, but if you join one of the main groups (marzipan or gameofkings) you'll be able to keep up with the fan gatherings. Just don't join until you finish the series, though, or you'll end up completely spoiled.