For this event you have to be in possession of a negative corona test, which you have acquired by signing up for one in the CoronaCheck app. The test locations are only open during office hours and your result will be valid for 40 hours. After those 40 hours it will not be sufficient to acquire entry to the borrel. The five euros that you have to pay for the borrel will net you two tokens which you can exchange for a drink each at the Heeren (or two tokens for a cocktail) This means you don't actually pay for entry, but you pay in advance for two drinks.
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