The introduction of technology in the public school teaching process could help increasing the weak motivation we can observe toward engineering studies. To achieve this goal, one main obstacle is motivating public school teachers to use technological tools in their teaching activity. In this paper we present how to use a large public robotic festival to introduce such educational tools to teachers. A survey made among the teachers helps in understanding their expectations in this particular context and the potential impact of this action, giving hints on how to run this type of activity.