If you start with very specific contests like art, science, memes etc., then you would be restricting it to a very small subset within the Indian steem community. Which isn't a great way to make a contest popular.

To get most people to participate (at least initially), keep it open. You are allowed to post within that week (assuming weekly contest) a meme, blog, photos, text, travelogue or anything else in your field of expertise, with their being only one applicable condition. It should be about India.

Want to write a poem, go for it. It should be about India. Want to talk about Indian politics sure. Want to come up with some crazy meme which will have everyone in splits, awesome.

This way we can get top quality India specific content.

To make life easier for you. Have 3-5 judges from different fields of expertise. So it will be easier to narrow down the winner and make the participants feel that it is a fair contest.

Reference contest:

https://steemit.com/steemit/@bycoleman/usd45-sbd-steemit-writing-contest-writer-s-needed-the-more-writers-the-more-winners

A blog from one of the judges with regards to the contest:

https://steemit.com/contest/@nihalmaz/bycoleman-writing-contest-my-takes-and-thoughts-as-a-judge