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Me, i would shoot tight in crowds like interesting faces, clothing accessories and when you're in the clear just ask if some of the people would pose for you but you should offer them your online site or email them a copy of their image.
The above should work well with crowds, pretty much takes flash out of the equation, with the people who pose for you pick a monotoned background like a wall or a big bright window, just use enough fill light to balance foreground to background i would go for a 1:2 or 1:3 ratio.
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