I especially hate that others can watch the tuber and tell that I'm out of tune when I'm playing. It makes me nervous.
A simple piece of cloth will take care of this. Instant cover, and uncover.
You can use a nice cloth, handkerchief, or an old cloth. No one will bother you either way. And then after the gig, use the same cloth to dry off your strings.
turning it off and on is ok too. The startup time is not that long, and really you'd only check your tuning in between sets. A good bass will stay in tune.
