For the 100. Anniversary of the appointment of the Holy Mary as the patron of Bavaria, the catholic community of the seven Bavarian dioceses celebrated their national patron with a pilgrimage on the Munich Marienplatz. Over 10.000 people participated at the procession and at the ceremony on the Marienplatz. The extes GmbH provided for the archdiocese of Munich all necessary plans and security concepts. The evacuation strategies and rescue plans as well as concepts for traffic management and security were implemented successfully by extes GmbH , based on areal and usage analyses. Person flows simulations with different scenarios were developed in advance. The gained information combined with a realtime head count detecting system gave result to the foundation of a smooth running of the event.