Only In Switzerland 15 - Splashtival with Blue Man Group

A picturesque town is transformed into a vibrant stage for a live concert by the Blue Man Group, followed by a spectacular laser show and fireworks display. This event, organized by Swatch to celebrate their 333rd millionth watch, featured a unique performance where the Blue Man Group created a new live design. This rare event, described as happening once in a blue moon, took place in Switzerland.

How did the audience react to the live concert and laser show?

What does the phrase 'once in a blue moon' imply in the context of this event?