The Grace Period Was Doing the Work: A Cross-Venue Comparison of Absence-Skipping and Strict Submission-Order Song-Queue Policies on Karaoke Session Throughput and Walk-In WaitResolving to The Grace Period Was Doing the Work: A Cross-Venue Comparison of Absence-Skipping and Strict Submission-Order Song-Queue Policies on Karaoke Session Throughput and Walk-In Wait…