We also participate in a science fair. Our grade level {1st grade} does our own "science fair" and the kiddos LOVE it! I send home the project with a note and the students fill out the journal and complete an experiment with the help of their parents. Here is the science fair journal booklet and the note to send home to parents {click *here* for the parent note}. When you download this, you'll have to know the order because this is a folded and stapled in half book. The order is {Cover, topic, purpose, hypothesis, list of materials, procedure, research, journal pages, graph paper and conclusion}. The pages are somewhat interchangeable so hopefully you can make it work:
What works for you when teaching science?