Academics try to solve issues related to a field. A masters thesis answer a question based on two assumptions using an academic, aka peer reviewed, methodology. Engineers try to solve specific issues related to specific settings (e.g. Solutions to expand the lifespan of X types of bridge submitted to Y factors) while social sciences try to explain social trends and phenomenon and linguists details how the structure of language are affecting cultures and groups of people.

As for event planning, it seems more of a professional orientation. Marketing, booking, scheduling, promoting the event are part of the equation and sucessful people are more enclined to have lots of experience instead of asnwering though questions.

If you want a masters degree RELATED to event planning, the best bet would be to enroll in a MBA and focus your projects and research on certain aspects of event planning.

Good luck!