So I searched online for the best cure, and there is one!! Facebook didn't have this before, but have incorporated a brilliant option to block event invites without blocking the person as a whole. Whoopee!
If you go to privacy shortcuts -> more settings
On the left side of the window, click blocking
There are two options available:
1. Block app invites
2. Block event invites
And viola! Hope it helped you, as much as it helped me.
All the credits to Roberto Aloi.