this is the best way to go about it in my opinion..
1) apply for the emergency irish passport after you get the naturalisation.. this will cost more but you'll get it within a couple of days according to my native irish friends.
2) apply for OCI on emergency as well which will cost you more but i think i read that you get it that day itself.
Best you confirm these with the irish passport office and indian embassy.
If everything fails, request to postpone the ceremony because you already made travel plans.
I'm not sure if the above mentioned emergency conditions apply to first time passport and oci card.
Hope everything goes well!