noun
A designated building or room for gatherings, often used for community events, club meetings, or public assemblies.
町内会の会合は集会所で開かれる。
The neighborhood association meeting is held at the meeting place.
新しい集会所
A new assembly hall was built near the station.
会館 is a general term for a hall or building for meetings and events, often larger or more formal than a 集会所.
Compound of 集会 (meeting, assembly) and 所 (place). The reading is standard on'yomi.