Bob and Patti Vasconcellos have gone to a local karaoke bar to sing almost every night for decades. Now in their late 70s and early 80s, they hit the floor with their walkers, and the crowd goes wild.

Owner Khanh Nansel, who also runs Karaoke Best Price Equipment in Sacramento’s South Pointe Plaza, could not be reached for comment. However, the menu will likely feature a variety of Vietnamese ...