Grand Tribunal 2018 is set for Friday 17th to Sunday 19th August 2018 in sunny Cheltenham!
http://www.grandtribunal.org/wiki/Main_Page has the details - CJ hasn't removed the early bird prices yet so you can still book at a bargain rate.
As ever, the organisers are eager to see what games people are willing to run this year, and if anyone wants to write a freeform game for Saturday morning. The convention benefits if we have a greater range of games available and if the freeform isn't written by the same people every year, so start thinking about anything you'd like to storyguide!
Grand Tribunal - probably the world's greatest gathering of Ars Magica fans.