[Wavytone]

From personal experience schools tend to set the date with little room to move regarding the moon phase. If you are lucky the moon will be 3-4 days old in which case you have the opportunity to show it and still have a few bright galaxies in reach. More moon than that and all DSO's are basically no-go, and all you will have are bright stars, multiple stars, open clusters, globulars and planets. Alternatively if its a moonless evening then the DSOs are on.

In the preamble make clear roll-on insect repellant is a must, together with long sleeves and trousers or jeans to prevent being bitten - but I would insist that sprays MUST NOT be used as these will destroy optical coatings on objectives and coatings.

The scopes have to be onsite set up and ready to rock before the visitors arrive. Those with lengthy set-ups had better get their act together.

Set tripods and eyepieces low to suit the littlies.

Have someone knowledgeable with a laser pointer ready to point out where each target is in the sky, and a few words to say about each object. Challenge the audience by asking them what they know.

Have a short stepladder handy (the folding things from Bunnings with 2 steps) - useful for those who want to rest a hand on something to steady themselves.

Once you know what scopes are coming assign specific targets to suit the scopes, for example if there's a decent mak or large SCT on a tracking mount, use this for planets; use the dobs for DSO's and use refractors for open clusters.

Try to avoid the situation where every scope ends up pointed at Jupiter or Omega Cen, for example.

I'd also print and hand out copies of a "challenge" for the kids to tick off of the top-ten targets for the night, this way those that are interested can google the targets later for themselves or talk about it in class, but make sure the scopes are showing them.