Yea they were and they cited that the whole venue fell under the Michigan Liquor Control Act since there were no fixed beer tents and consumption was allowed throughout the venue. The also cited there were school activities (didn't see anything indicating that personally) in the venue. Funny thing about the Beer carts is they were sponsored by Oakland and Macomb County child advocacy groups. We spoke to the Chief of Police there and he was very polite and professional. He said something to the effect that the CPL checks were to keep the city council happy. All in all a good day, except for the walk from the back 40 of the parking lot in a near swamp lol. Only kids that were screaming were the ones on the rides. Passed out some trifolds to interested people, had some good conversations with many people.