Jon Stewart mentioned in his interview by Terry Gross that proceeds from his march will be given for maintenance of the Mall. And, I see that on the FAQ page of the Rally to Restore Sanity website they give the details:

5) Can I make a donation to support the Rally to Restore Sanity?

We encourage you to make donations to the Trust for The National Mall. We feel it's important to preserve this historic site for future rallies and for future Americans to rally on! And let's face it; we're a little afraid that you might make a mess. We really, really hope you don't — we hope that, in the name of sanity and reasonableness, you won't be dicks and will actually pick up after yourselves. But just in case you accidentally, like, put a beverage down on the Mall's coffee table without using a coaster, we figure that giving a little something back to the National Mall might, at least, soften the blow. But really, mainly, it's about the "preserving the historic site" thing. Donate here.

Also, all proceeds from sales of the official Rally to Restore Sanity merchandise will be donated to the Trust for the National Mall.

6) Where can I get more information on the Trust for the National Mall?

Please visit the Trust of the National Mall website for more detailed information.

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So, that's one for the grass, Q.

~ Becky in Long Beach