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I have done a few science type days for pre school/primary kids. You have to be well organized and remember that their attention span per topic is all of 5 mins so you have to keep mixing it up. You might get 1/2 hr or so having them sit there looking at pics and the like but after that they will want to do something else. Kids at that age love hands on stuff. Have them build something or draw something to take home. Not sure of the resources at the pre school. Pin hole camera might be ok and they can pretend it is a telescope. Not hard to build but will need adults.
I would not let any young primary/pre school age child view the sun in any form. It is just too dangerous and I suspect the school will not allow it. Maybe kids in 4 and above maybe ok but the young ones never. I did a space day at my sons school some 2 years back to 3/4's and the school would not let me do it. Instead I download a video of the sun and showed them that. I think we also made sun dials in that session.
Showing kids things through a telescope is fantastic but it does take a while. This year I was on the schools 3/4 camp with my son and took my 8" dob along as well. It took almost 2 hrs to show 83 kids saturn. Most of the kids had not looked through an eye piece before so it took them a while to figure it out (with my help). You do not need a patch. Tell them to keep both eyes open and just put one hand over their eye. It was well worth the effort though. Most kids will be happy to see the moon or Jupiter, Saturn. Better to show them something that they know. It has a greater impact.
Might even be worth using a program like stellarium if the school has interactive white boards.
I always have great fun doing these type of things so good luck!
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