Which innovative marketing strategy led to a 40% increase in planetarium attendance globally between 2015-2018?

In the competitive world of astronomy retail and education, planetariums have had to evolve their marketing strategies to attract visitors in the digital age. One particular marketing innovation dramatically increased attendance at planetariums worldwide in the mid-2010s. Test your knowledge about this revolutionary customer engagement approach that changed how these astronomical venues connect with audiences.

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The 'Star Adoption' loyalty program where visitors could 'adopt' and track specific stars through personalized mobile notifications
Immersive 'Dark Sky Experience' events combining astronomy viewing with guided meditation and sensory experiences
The 'Cosmic Passport' digital collection app where visitors earned virtual badges from different celestial observations
Subscription-based 'Universe Insider' memberships offering exclusive access to live streams of astronomical phenomena