Hello,
Greetings.
First of all, I must say you had and amazing choice for your future. It has so much of scope and diversification as an individual growth. According to my sources, I have the following data with me to answer your question. Top Colleges in MBA in Event Management are:

1. National Academy of Event Management and Development (NAEMD)
(Ahmedabad, Mumbai, Delhi, Jaipur)
NAEMD is an institute specialized in Event education, it has been offering its services to the Industry for more than a decade.
NAEMD Courses:
DEM (Diploma in Event Management)
Duration: 1 year  part time
Eligibility: HSC (10+2) any discipline
Classes: 3 days a week
MBA in Event Management & PR
Duration: 2 years  full time
Eligibility: Any Graduate
Classes: 3 to 5 days a week

2. Indian Institute of Learning and Advanced Development
INLEAD is an ISO 9001-2008 certified premiere education institution. They offer sector specialized Post-Graduate Programs in Event Management & Public Relations. They have an illustrious list of industry partners, and INLEAD offers 100% placement assistance to all its students.
INLEAD Courses:
MBA / PGDM in Event Management & Public Relations
Duration: 1 year
Eligibility: Any Graduate
Professional Certificate in Event Management:
Duration: 1 year
Eligibility: 12th pass and above

3. EMDI Institute of Media & Communication
It is one of the best in Event Management training since it started in 2002. They have over 7000 alumni in the Entertainment & Media sector.
EMDI Courses:
PGDEM (Post Graduate Diploma in Event Management)
Duration: 1 year part  time
Eligibility: Any graduate

4. National Institute of Event Management (NIEM)
NIEM is one of the Asias first and best event management institute. They offer courses in Mumbai, Ahmedabad, Kolhapur, Pune, Odisha and Jodhpur.
NIEM Courses:
DEM (Diploma in Event Management)
Duration: 11 months part  time
Eligibility: HSC (10+2) any discipline

I must say do well and have one of the best option for all these.

Good luck!