Yes, the DL 5Ks have always started in the park. The longer distances used to start over by Paradise Pier/DL Hotel, but they've moved it offsite. From the maps, it appears there will be entries with security checks at both sides, but nobody is sure as this is the first time they've used this location.
One more dislike to add: they told everyone to arrive early for security, then held the whole line until 4:10 when they finally opened the DL gates. If you got there early enough, the line was looped inside, past security. Hearing the CM chatter, it legit sounded like some had no idea a race was planned today!
Also, snack box:
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