Use the party theme set called Gram Slam. You have your plates, cups, invites balloons, table cloth all in your theme. Set up you could do in your garage - you make a baseball green with chalk (home base and all) and do a stand and serve pop corn, hot dogs and coke (all American). In your invites don't forget to include a game ticket to get them into Trevor's birthday party or they could use them for food. I found Stars at the stationary store and will use Red/and Blue the color theme of the Gramd Slam party.  CAKE Use cupcakes and frost white and put on the red lines and add your child's name (sign by Trevor). or Do a round cake and use the Grand slam cake topper.  ICE CREAM You purchase Baseball hats and the kids get to make their own sundies.  FAVORS Baseball keychains. This was a little harder but all leagues if you ask have baseball cards and they will give them to your free. I wrote to the majors and most of them sent something, some were really great. However our favorite the Dodgers wouldn't help out, but you can get free cards at their game from their robot. Little baseball hats and fill with peanuts. Be sure to add cracker jacks! Baseball pencils along with the little baseball note pads.  PRIZES Baseball board, Baseball straw, and of course Award ribbons. Let the game begin! One Two Three strikes and your OUT!