Together with organizers of the Rhizo4 conference (www.rhizo4.org/) starting on Sunday 21 June in Maastricht which is only 30 km far from Liège, we would like to encourage participation at both events and propose a 50 euros reduction of the registration fee (see registration page). Excursions/social events will be organized on Saturday 20 for people who prefer to leave Liège for Maastricht on the Sunday morning (trains departing every hour with travel time of about 30 minutes).