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. 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.