N.H.
Libraries usually have things going on for all ages. I know the local one has a type of treasure hunt for information and the kids looked really excited.
If you live near Linthicum, we have the Electronics Museum on Nursery Road which most people don't realize is here. It has wonderful hand-on displays for kids. The space room is awesome; plus they have a camera which has been to the moon. Only 3 in existense. One still on the moon, one at Smithsonian, and one in Linthicum. It's free, just a donation. Open 10-3, except Sunday.