Can I pursue event management after completing interior designing?

Definitely yes - it completely depends on what is your area of interest. Assuming it is design and decor - you can get into Event Designing initially. And from there start learning the different ropes of Event Management. Hope it helps.

Yes, you can pursue event management after completing interior designing. It will help you in managing different events plus doing interior for the same. I suggest you to also do small Vastu course with these two. It will be more beneficial for you.