Since you're in the UK, look at [1] and perhaps check topics that interest you and follow the names at [2]. Then we have the European Social Simulation Association [3] with Summer Schools and annual conferences.

[1] http://cress.soc.surrey.ac.uk/web/home

[2] http://jasss.soc.surrey.ac.uk/JASSS.html

[3] http://www.essa.eu.org/