Mass Communication & Media

For this, you can do a Bachelor's degree or even Master's degree on film production and all. Look for colleges which provide you with editing and stuff.

Yes, you may apply for mass communication after 12th if it's your desired field but you have to get at least above 55% in your class 12th board that too with English as one of the best four subjects.

Please refer to the link provided below for a list of colleges which offer courses in mass communication and journalism in Mumbai. You should be able to navigate to a college of your choice using the filters on the webpage. Important details like fee structures, affiliations and recognition, brochures are available at the link provided below:
https://www.shiksha.com/mass-communication-media/colleges/colleges-mumbai

You may join an MBA in event management course.

Yes, the course includes the topics that you have mentioned. for the current course syllabus please refer:
https://christuniversity.in/humanities-and-social-sciences/business-studies-and-social-sciences/ba-hj/syllabus/404/2017
And for more information regarding the course refer to https://christuniversity.in/humanities-and-social-sciences/business-studies-and-social-sciences/ba-hj

Hi,
Placements (in INR; as provided by college)
Maximum Salary (Annual): 16.00 Lakh
Companies where students got placed
Aditya Birla Group American Express Asian Paints BAJAJ Allianz Bharti AXA Blue Star Cummins Deloitte Deutsche Bank Ford Motors HCL ICICI Securities Idea Cellular Services IndusInd Bank Jet Airways Kotak Mahindra Bank L&T Infra Finance network 18 PepsiCo Raymonds Taj Group of Hotels TATA AIG Insurance Thomson Reuters Virgin MobileIndia
https://www.shiksha.com/mba/course/pgdm-in-marketing-management-international-school-of-business-and-media-nande-pune-164937

Manager position not only comes after qualification but a lot of experience as well. You need to ensure that the field you choose is of your interest and you perform well. The position will be given once you have at least 5-7 years of experience.