1. First of all, what is the party for? Perhaps your team have your team hit their annual targets or won a new chunk of business. Maybe someone is retiring or you want to throw a party to thank clients for their custom.
2. Once you know what the corporate party is for, you can start to draw up a list of people to invite. They may be all internal, which will make the invitation process smoother, or you may need to send something out to invite people.
3. Once you've got your invite list, you should have a good idea of how many people will be coming to the party. This information will help you when choosing a venue, as you'll need to find somewhere that has the room for everyone.