Sorry to say but that's gonna be a tough one, you're highly unlikely to reach that amount through donations. You should instead look at doing small jobs in exchange for Bitcoin.
Have a look here: http://www.reddit.com/r/Jobs4Bitcoins/ 
You can sometimes find work on here as well, see the services section, I recently found a thread (although I cannot remember where on the forum) where some guy was paying pretty decent money (in BTC) for well-written articles on Bitcoin.