assemblage, gathering - a group of persons together in one place

hive - a teeming multitude

horde, host, legion - a vast multitude

ruck, herd - a crowd especially of ordinary or undistinguished persons or things; "his brilliance raised him above the ruck"; "the children resembled a fairy herd"

hall, hallway - an interior passage or corridor onto which rooms open; "the elevators were at the end of the hall"

merging, coming together, meeting - the act of joining together as one; "the merging of the two groups occurred quickly"; "there was no meeting of minds"