Also, I think anytime you can host it at a time when they're already at church, that's a win! And anything you can do to make it easier to attend (like provide childcare), that cuts down on reasons not to come. If you live-stream, you run the risk of people choosing that option over coming in person, so I'd recommend you record it (but don't live-stream it) and then share the recording with those who couldn't make it + do something to follow up with them to make sure they watch it, even if it's something as simple as signing something that says "I watched the VBS training video."