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Knowledgeable hop-heads know you can't just turn up on Saturday. You've got to buy a ticket - in person and in cash - sometime during the preceding five days. The class seats 40 people and costs $25.
On a budget? The Map Room also hosts "International Night" every Tuesday at 7pm, and provides free chow from local ethnic eateries - say, Vietnamese pho, Polish pierogi, or Cuban sandwiches - as long as you buy two drinks from the 200-strong global brewski list.