a place (in a building or enclosed by buildings) where people come together

passageway

a meeting-point of rays of light, heat etc; a point, distance, where the sharpest outline is given (to the eye, through a telescope, through a lens on a camera etc)

center of attraction

a place often visited (by the (kinds of) people mentioned)

place for socializing

a large dining-room (e.g. in a college)

room for large affairs