Hello there. Hope you are doing good. I would like to tell you that both are entirely different field of study. Your area of interest is of utmost importance while deciding which career option to choose. Event management requires you to have an extrovert personality, good management skills, communication skills and also you need to be someone who can manage stressful situation. However, BCA data science requires you to have deep interest in computers as you will taught web designing, programming languages, computer algorithms, networking. So, both the courses are suited for students with different interest and personality. If you feel you are good at computers and want to pursue your further education and career in similar field, you can go for BCA and if event management suits you, you can go for it.

I hope you found this answer helpful. Good luck for your future.