Challenge 3 and 4 could be quite interesting to get other communities interested in OSM.
For Wikidata matching, we can share the challenge with the Wikimedia India chapter. Adding these tags also help make maps on Wikipedia. See Naveens' diary http://www.openstreetmap.org/user/naveenpf/diary/40515 For any railway mapping we can spread the word on IRFCA, which would get the railfans really excited. Srihari, if you can make the challenges, I could help spread the word. We could also do mapping sprints to map them together with others to knock it off.
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