Hi Andy, 25 is not a big number so don't panic. If you are using 2 telescopes on your own use the ones with tracking and have a helper supervise the second scope. I wouldn't recommend setting up more than two scopes without an experienced helper, that's a lot of work.
Do a bit of a talk about some of the brighter objects to start of with, I usually check for ISS passes if your lucky that's always a crowd pleaser. As the others have said, stick with the brighter objects and not too many. By the time everyone has had a look at Jupiter and Saturn a couple of times the best part of a hour will have passed. Keep it simple and enjoy.
Rick
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