We used ポケトーク (PockeTalk)! Instant transcription & translation on audience members’ smartphones. I didn’t use it at the event but it seemed pretty good when I tested it.
nostr:npub16vrkgd28wq6n0h77lqgu8h4fdu0eapxgyj0zqq6ngfvjf2vs3nuq5mp2va let me know if you want more info