Am I eligible to pursue MBA in event management after B.Sc?

Yes, you are eligible. Go for it. All the best.

If you are pursuing after completing graduation you can apply for PG Diploma courses after pursuing graduation (any field) with a minimum of 50% marks.

Yes, you can pursue MBA in event management after having B.Sc. Degree.

Yes, you can pursue MBA in event management. For courses like MBA, there is no restriction of qualification in particular subject. The only requirement is graduation with 50% marks.