If it's a cost and/or struggle, I probably generally wouldn't use power because I'm unlikely to tether. If we do decide we need power, I have a decent-sized power inverter that would power us for a couple of days. I can bring it and could meet anywhere if power's a limiting factor, though it's bulky so I'd prefer not to move it around a bunch. If we're outdoors or in very highly lit areas without wifi, I probably just wont bother bringing my laptop because I don't love tethering and usually have trouble viewing screens in bright light. It's not a big deal, just means there's less we can demonstrate so our meetings end up being a little more discussion-based and theoretical.
Thanks for handling those kids, though.