Event Management

See you are already clear in your perspective for future that after BBA you need to do event management. So, no need to do anything apart from these things concentrate on this. That's it and even if you are going for a Diploma in event management, there is no other thing you need to do. You can even do it along with your BBA so that you can get extra benefits of experience along with BBA
And yes, one thing you can do if you are not going for Diploma is to go for event management as your specialisation in both BBA and MBA (if interested). That will benefit you a lot as it will only give you the direction towards your goal i.e. to be an event manager or something you have planned.
Hope you got the point.

Hi Apoorva, event management courses can be found in associate's and Bachelor's degree programs in meeting and event management, hospitality or tourism. Some degree programs offer online training. Certificate programs, both undergraduate and graduate, offer courses in event management without general education requirements.
Concepts one could expect to study in event management courses include:
Fundraising and sponsorship
Catering and hospitality management
Meeting management
Financial management
Contract management
Public relations and promotions
Food service management
Tourism
Some programs include an internship. Graduate event management certificate programs are geared towards
the students with business or marketing backgrounds.
All the best.