Sep 10 - 11 -- Mathematical Models in Ecology and Evolution 2009, University of Bristol.

http://www.cs.bris.ac.uk/mmee2009/

Sep 14-18 6th -- conference of the European Social Simulation Association (ESSA), Surrey, Guildford. 

http://cress.soc.surrey.ac.uk/essa2009/

Sept. 20-25 -- European Conference on Complex Systems (ECCS09), Warwick.

http://css.csregistry.org/tiki-index.php 

Oct 18-23 Systems Chemistry II: Evolution and Systems, Balatonfüred/Lake Balaton, Hungary

http://www.cost.esf.org/events/systems_chemistry