The venue - this can be a toughy! The easiest in terms of your organising is to have it at your house where your kitchen, fridge and bathroom are handy, but not all of us want to have 15 children under 5 racing through the en suite, playing hide and seek, do we? You could look at a local park (make sure it has toilet facilities), a local hall or even a venue that has party rooms, with many of these offering to cater for you for a fee.