You test at least 3-5 strong slogans before choosing one. The testing method consists of three steps:
Measure quantitatively with scores and percentages. Many companies choose on gut feeling and regret it later: data helps prevent this. For large events (200+ guests, brand budget €5k+) it is worth really testing. For smaller ones you can manage with 2-3 slogans and the internal core team. Live Impact advises on the testing approach and chooses data-driven.