Travel-around-the-world-party. Decorate the house with flags and posters of famous buildings and sights (such as the Eiffel tower in Paris) and a large world map with pinpoint flags (to indicate where you are going).  For an invitation, send every child a passport (you will sometimes need to collect some information beforehand, like birthdays and stuff) and travel documents (plane, bus , boat, train tickets). Ask children to bring a suitcase, sunglasses, hats or whatever tourist stuff they wanted to bring.    Upon arrival, take a Polaroid picture of every child and glue it into the passport. (keep some blank passports and tickets for children who forgot them).  Have an adult dressed like a stewardess, or a captain, or a bus driver ( or all of them, if you have enough adults).  Make sure you have as many chairs as there are children, and arrange the chairs as in a bus. Put some kind of ribbon around it. Then 'leave' to your first destination. Make sure it looks real: announce your departure, make a last call, etc... (Everytime we traveled, we had some appropriate music on, or we sang some songs about our destination.)  For us the first destination was France.  Upon arrival, children were controlled by a 'custom officer' and received a stamp in their passport. In every destination the 'guide' (mother) explains something about the country. France was the country of the impressionists.  The game we did was 'pictionary': there was a 'real' painter's easel, and the children had to guess what was drawn.  As a 'souvenir', they received a pencil, and before 'leaving' we ate some French fries (very small portion, you don't want them to be sick).   On the train (rearrange the chairs) then, to Italy. Again a stamp in their passport, as in every other destination.  In Italy, we went to Pisa, where the crooked tower is. The children were divided into two groups, and had to build as large a tower as the could in 1 minute. After that, they had a mini-pizza, and got their souvenir (a toy car supposedly a 'Ferrari').   On the plane then, to our third destination: the United States. On the plane, a refreshment is served (drink). America is the country of cowboys and 'indians' - the politically correct 'native Americans' is unknown to our children. We did an estafette in which they had to shoot with bow and arrow.  Afterwards, they received their souvenir (a sheriff's star) and ate a mini-hamburger.  We came back from the States by boat. It was the QEII so we had to put on our sunglasses while sunbathing on the deck. We arrived in England, which is the country of Agatha Christie and Sherlock Holmes. The children received a magnifier glass to look as a good detective for the stolen jewel. They found it, it was a candy-necklace (that is, one for each of them). As everyone knows food tastes awful in Britain, we did not eat anything else and went home (to Belgium) through the Chunnel (so by train).  We arrived home right in time for the birthday cake.  The cake was rectangular and represented a world map. I had the candles stand in a little train that is sold especially for that purpose, and besides that, we had little flags on them representing the places where we had been.      Before going home, they received their last party favor: a camera that shoots 'water' instead of photo's.