Hi there,
Consider how many scopes you will be using & how susceptible they are to being nudged off target. You will need one person man each dob & either knows how to use it, or have them sit on the moon as it is the easiest to find. Eq scopes usually have decent clamps & a clock drive- have one sit on Jupiter because of the high power needed & choose the EP to suit conditions- may only be able to use 100X-150X. You may find if you don't have enough hands on deck to man scopes (and there is no way you can do two or more, scopes WILL be bumped many, many times) these scopes will chuff along happily, even with half decent alignment.
Have a look at my last entry in this forum on showing the sky to 4 & 5 year olds,
http://www.iceinspace.com.au/forum/s...0&postcount=27. Don't think that the age group is too young- their parents weren't and you can only show & tell so much. Remember KISS. It is not 'dumbing down'. The sky is a big place & we've already had a lot of time to acquaint ourselves with it.
With respects to crowd control, you can break them up into two groups & deal with them one at a time, or all at once- they will patiently form ques behind each scope- scopes have a majesty that demands respect & patience I have found,
. Plus no one wants to damage one for the fear of paying for it. I had about 100 people at my last show & tell. No crowd control issues. More my own anxiety.
Clear skies for the night.