Wahoo, Keep Off The Grass?

One of Oxford's main sports bar, Wahoo on Hythe Bridge Street, has done a strange thing I think.  Perhaps to promote the European Football Cup they have laid synthetic grass out the front of the bar, which is also the entrance, then put up these signs saying "Keep Off The Grass"?  How are you suppose to get into the bar, if there are signs saying Keep Off? Strange marketing in my opinion