Claiming existing event posters to promote the night bus

To promote the evening and night buses, public bus company De Lijn has launched a large scale guerilla campaign. In all major cities they stuck passe-partouts on existing event posters with the text: whatever you are planning tonight, also plan your transport.The campaign also has an interactive part. Organisers of events are given the chance to promote their event on the real buses of De Lijn. All they have to do, is to upload their poster on