Unlike Phish who have phish.net, the Grateful Dead don't seem to have a single canonical setlist database.
http://setlist.com/
ftp://gdead.berkeley.edu/pub/gdead/set-lists/
http://www.deadbase.com/
http://www.setlists.net/
http://www.deadlists.com/default.asp
http://www.setlist.fm/setlists/grateful-dead-bd6ad4a.html
http://www.rukind.com/gdpedia/
http://www.dead.net/shows/all
While it is not built by the community, the setlist.fm database is the most desirable to work with since it has and API http://api.setlist.fm/docs/index.html
While not a setlist site, http://www.deadlistening.com/ has good reviews and recommendations that would be cool to link in to the database.