Comet 103P/Hartley 2 will be (dimly) visible over the next couple of weeks . Should be particularly easy to find as it skirts under Cassiopeia though at magnitude 5-6 it will be challenging to see in light polluted areas.
A popular activity with elementary teachers, a moon journal gets kids outside and observing the moon. The folks on the Lunar Reconnaissance Orbiter project have created a simple one sheet (front and back) PDF to make it easy to assign this to a class full of young astronomers. Galileo did it, now your class can do it too.