Hi Gaeron - Just some "big brother" type advice:
I wouldn't have assigned any volunteers to the kids until Saturday morning. Life has a habit of interfering with even the most reliable people. If a volunteer doesn't have anyone assigned to them beforehand, they might choose to not show up thinking they're "not needed".
Also, it might be helpful if you get a basic inventory of gear from the kids - like what rod wts they have, wading gear, etc. A good idea would be to have each volunteer bring a spare rod that would be suitable for the method they plan on using/teaching.
Having someone wade for the first time might not be too good of an idea, especially if they're using borrowed gear that doesn't fit them well. It's a bad time of year to go for an accidental swim. Also, make sure the kids have a change of clothes in case they do take a swim. The fly shop should be available for people to warm up in, but it's not always that warm inside.
Don't stress over this event. Our guys always come through, and if things don't work out perfectly, just improvise. It's just like fishing - see what you're faced with, and adapt accordingly. Being prepared makes it easier.
Lastly, even if things wind up really crummy (like weather), coffee/hot chocolate and donuts go a long way towards keeping the troops happy. I'll cover you on this one.
Relax - it'll turn out just fine.
H.A.
