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I saw a large group (100+) of people warming up in the common and eventually going on a run with the guy leading wearing a speaker on his back. This was around 7pm. Does anyone know what that was?

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I saw a large group (100+) of people warming up in the common and eventually going on a run with the guy leading wearing a speaker on his back. This was around 7pm. Does anyone know what that was?	1