babycentre says: Games wise, try Musical Statues, Pass the Parcel, Mummy Wrapping (in which the children wrap willing volunteers up in toilet roll -- the best mummy wins), Follow my Leader, The Music Man and other active, but short, games. Some entertainers will organise the games for you. This age group can't cope with too much competition, so traditional games may need to be adapted, or even fixed, to give everyone a chance to win something at some point. Have a big bag full of small, cheap, fun prizes.
Children eat very little at parties so don't overdose on food: anything small, bite-size and attractively colourful works well. Display savouries first, sweet things later, to encourage balance. Try cherry tomatoes, cucumber and carrot sticks, seedless grapes, cartons of juice with straws, mini sandwiches, sausage rolls, crisps and iced biscuits. Try to avoid gooey cake which gets squashed in party bags and becomes only fit for doggy fodder when it reaches home!
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I think a teddy bears picnic is a lovely idea, so they would all bring their favourite teddy, and sit around on blankets with little sandwiches etc? Some bunting and balloons would be nice to decorate the garden with, and maybe someone in a cheap teddy constume (i.e you!) to lead the games. Or you could hand out teddy masks/ears to each child as they walked in.