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Tacos might have cornered the market on Tuesdays, but never discount the power of a burger. Getting its own special National Hamburger Day on May 28, local meat-lovers have a chance to celebrate with Michelin-starred Chef John Fraser's Big Grin free burgers at his Lineup food hall location in the Financial District. From 11:30am-3pm the chef will be giving away free burgers to the first 100 guests. Don’t make the cut? You can still walk away with a big grin - vouchers for free crinkle-cut fries will also be handed out to anyone in line who misses the burger giveaway.