Hi Rachel! My Lovely Sister organized a baby shower for me when i was preg with DS. I had mine when I was 7months, ( I didnt want to leave it too late, as I really wanted to enjoy it!!!) We basically had lots of games and had Dinner pre prepared for all too, mainly finger foods. If you google baby shower party games, you can get a heap of ideas for entertainment for the day....
You could fill a Jar of Jelly Babies, and whoever is closest to guessing how many are in the jar, wins the Jelly Babies, another game is the Peg game, or the string game, where everyone cuts of a piece of string which they think would go around your preg belly, and who ever has the closest length wins a prize....Just a few to mention...Have a great time organizing it.....Its a great day and one to remember forever