(1) No banquet permittee, or employee thereof, may knowingly permit the service to or consumption of liquor by any person under the age of twenty-one years who is present at the event for which a banquet permit has been issued.

(2) No banquet permittee, or employee thereof, may knowingly permit any disorderly conduct to occur or serve or permit the consumption of liquor by an apparently intoxicated person(s) on the premises for which a banquet permit has been issued.

(3) The banquet permit shall be posted in a conspicuous place at the premises for which the permit was issued during all times the permit is in use.