I'm often in the situation where I'm setting up for a gig and one of my bandmates hasn't arrived yet. I don't want to take the time to call them to see if they're on the way, and I don't want to text them if they're driving. But it would be helpful to know if they're on the way and how soon I can expect them, or if I need to call and remind them of the event or plan to go ahead without them.
I could add a feature to BandHelper that starts tracking participating users' locations two hours before a scheduled event, and shows their locations on a map. Or for greater privacy, it could just show whether they are moving, along with an estimated time of arrival. This would only track users who opt in, and only for users selected for the current event.
Does this sound cool, not useful or an invasion of privacy?