Luckily it's winter, maybe there'll be some storms in your area. A motivated guy with a shovel can make some $ that way.
Collecting cans is an idea if your state has a redemption law.
It's going to be hard to come up with that much in a short time, you may be better off finding 7 ways to make $200 than 1 way to make $1400. Sell off some old games, cd's, equipment etc...
You could also organize something. I had a friend who would get local bands, and rent out a hall for $250. He'd buy a bunch of soda from Sam's club (averaging out to about $.20 per can) and sell them for a dollar. He charged $10 for the tickets, and after the bands, hall, and other supplies were paid off, he still had some significant money left over. (200 people at $10 per is pretty attainable) If music isn't your thing, I'm sure you can think of some interest that would bring a bunch of people together. It may not be on the same scale as my friend, but like I said, you're probably going to have to do this step by step.
Washing dishes at a restaurant isn't that bad either, I did it. Sometimes it's a bit busy, but it pays OK, and you're not dealing with the general public like the waitstaff/busboys do.
Good Luck!
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O Wonder! How many goodly creatures there are here! How beauteous mankind is!