Wiktionary
n. The provision of seating or tables without reservations.
Usage examples of "open seating".
Then the corridor bent to the side to accommodate four enclosed double bedrooms and bent back again through the centre of open seating with sleeping curtains, called sections.
He asked ZORAC if there was anywhere nearby where he might get a drink and was informed that if he went out through the main door of the room he was in, turned right and followed the corridor for a short distance, he would come to an open seating area where refreshments were available.
Hansen followed, hungry enough not to realize that something beyond open seating was involved.
As he reached the reception desk the girl behind the counter smiled brightly and pointed to the open seating area in the bay window overlooking the Rhine.