This is a 21+ Event with valid form of identification. For US citizens, a valid DMV-issued photo ID or USA passport is required. For international guests, a valid passport is required. Doors 10pm bsmnt is a unique underground dance music nightclub in the basement of the W Hotel in Boston’s historic Theater District. Raw and unpolished, bsmnt is designed to support emerging acts and established artists looking to experiment and connect with their audiences in a more intimate setting. Nothing but dance music all night long. bsmnt is a unique underground dance music nightclub in the basement of the W Hotel in Boston’s historic Theater District. Raw and unpolished, bsmnt is designed to support emerging acts and established artists looking to experiment and connect with their audiences in a more intimate setting. Nothing but dance music all night long.