“Live at Liquid Room 30th Anniversary” lands at Knockdown Center as a live electronic set that looks back on a New York nightlife institution and the era it helped define. Jeff Mills, long tied to the Detroit-to-NYC circuit of techno, brings a DJ practice built on precision and restraint rather than spectacle. The evening functions less as nostalgia than as documentation: how dance floors archived new sounds before streaming did. One clear takeaway is the room itself becomes part of the instrument.