For my son's 7th birthday he wanted a science party. I made invitations on cardstock with cut outs of beakers, test tubes, and eye droppers. I wrote on them: Please come to "Dr. Olson's " laboratory to some "mysteries in science". The lab will be open from "3-5 pm" on Saturday, "February 25th". Please reserve your seat at "(phone number)". Please take the invitation into a dark room to read the missing parts.  Everything in quotation marks was written in a special ink that glows in the dark.  We had the kids put on eye goggles and lab coats made out of my husband's old white work shirts.  They also had to make an ID badge to gain entry into top secret rooms while guests arrived.  To make the ID badges I used an I-Zone camera to make fast, small photos to adhere to their badges. The kids wrote their names and used space and scioence stickers to decorate them. When all the guests had arrived, we moved into the kitchen to do a few experiments a s large group.  The first was the UV experiment using magic beads ordered from a science catalogue. We explained some basics about UV light and how intensity changes when there are filters.  The beads are perfectly white until you expose them to light. They rapidly change into colors as the UV light hits them.  Our experiment involved several ziplock bags of beads with differing levels of sunblock coated on them to show how UV rays are filtered out. This was a hit with moms because now the kids saw why they had to put on sunblock!!  The kids then got to make a bracelet to keep with the beads. The next experirment was the acid base test using red cabbbage dye and an indicator.  Again, before starting we explained some basics about acids and bases. We tested several items so that each guest could have a turn performing a test. Next we separated the kids into groups of 3-4 for a few science stations.  One station was oceans in a bottle.  We used empty water bottles and filled them half with water, half with oil, and added some blue food coloring and some plastic ocean beads. We glued the caps shut with super glue (adults did this part). The scientist (a friend there to help with the station) explained how oil and water do not mix, a density lesson. The next station was making Glarch ( a thickened gel similar to slime). Glarch is simple to make using Borax, white glue, water, and food coloring. You mix the ingredients together and put them in a ziploc or small plastic container.  The scientist here explained how molecules join together and how Borax is the Cross-linking agent.  Another station was sink or float.  We used an old fish tank filled with water and had several objects to test.  The scientist had the kids make predictions, then the kids performed the tests.  They learned about density a bit more at this station.  The next station was a slide show on my laptop show on a laptop computer with images from common things. The kids had to guess what each of the images were.  all through the different experiments, the kids were making notes in their science journal I had pre-made with small plastic binders for them to keep.  For a cake I made several small cakes to represent the solar system.  We made a lava punch using fruit punch and dry ice to make eruptions out of a cone  in the punch bowl.  As guests waited for parents to pick them up they got to peek into microscopes with different prepared slides.  The party favors included their glarch, the UV magic beads, the ocean in a bottle they made, a magnifying glass, their safety goggles, and science journal which included all experiments, pages for journaling, and websites for future explorations.