How could a cultural/events organisation set up an experiment to test the effectiveness of two forms of advertising? What elements of the ‘classic’ experimental design would need to be sacrificed?...

How could a cultural/events organisation set up an experiment to test the effectiveness of two forms of advertising? What elements of the ‘classic’ experimental design would need to be sacrificed? What type of quasi-experiment would this be?

Consider a successful arts facility or event known to you and outline the elements that might be involved in setting up a case study to explore the reasons for its success.