I'm going on a trip next month to help my wife with her meetings at Neobiota, scout for next year's sabbatical, and workshop with the Concordia principals. I'd enjoy meeting up with open source GIS, archaeology, or classics programmers along my route:
24-25 September: Prague, CZ
27-29 September: Colmar, FR
01-08 October: Arles and Montpellier, FR
12-15 October: London, UK
In other words: Praha, Argentorate, Argentovaria, Lugdunum, Arelate, and Londinium, with a side trip to Aquae Sulis. Looks like I could even bump into Andrew Turner.