For my son's 3rd birthday, we had a Go, Diego, Go! party at home.  I bought blue file folders and printed out Diego coloring sheets of animals and games from the nick jr. website. I made this look like the computer thing they use (sorry, the name escapes me). I set up teams by making the first sheet an animal with a track DIFFERENT in order to set up a scavenger hunt by following the animal tracks on the first page. I drew a computer keyboard, copied it and stapled it on the inside of the folder. So, one blue folder has an elephant on the first page, the next blue folder has a jaguar, the next one has a fox, etc. When the guests arrived, they picked a blue folder and decorated the cover with stickers.  I bought foam animal stickers at a school supply store, and animal print sheets of stickers that I cut into 4ths from oriental trader (online). I also collected paper towel tubes and the kids decorated their spotting scopes" which they used later during the scavenger hunt. I also printed out coloring sheets of alicia or diego and cut them out for the kids to color and glue onto generic handle bags for holding their stuff and could also be the goody bag. We hired baby animals to visit which the kids got to hold. The 3 year olds did not last more than 20 minutes with the animals despite the diversity. For those kids who needed more activities they played pin the tail on baby jaguar (siblings made this game) and worked on their spotting scopes.  We hired a company called "Barn Babies."  If you don't want this expense just add a couple more games.  Next there was pizza and cupcakes.  I bought cupcakes with different animals iced on (elephants lions etc.).  I go light on decorations.  I just bought Diego plates and napkins.  I used generic plastic tablecloth covers and juice boxes. The grand finale was the scavenger hunt. I copied the tracks of the animals on the first page of the blue folder.  There were about 10 tracks per animal that I taped all over the house. I had the kids follow the tracks holding their blue folders and using their spotting scope until they came to the end where they found a stuffed beanie baby of that animal type. You don't have to match the beanie baby with the animal you track but i was able to. If there are lots of kids you can do teams of kids (say 3-4 in a team and just make sure you coordinate the blue folders with appropriate number of first pages) and make sure you have same number of beanie babies at the end.  We had a "trading station" of lots of different stuffed beanie babies in case the kid did not like the animal they found. This worked out and is necessary with 3 year olds to prevent melt-downs b/c they wanted a different animal. Finally the kids left with goody bags filled with animal themed stuff purchased from oriental trader (pad of paper pencils bubbles stickers etc.) but the parents told me that was overkill.  The kids had their blue folders with about 20 coloring pages and games printed from the nick jr. website. Apparently many kids colored in this for weeks afterwards.  They also had their spotting scopes and a stuffed animal.  The party lasted about 2 hours and it was thoroughly enjoyed by all."