Generation Exhibitions recommends following a timeline of 10 months / 6 months / three months.10 months before the trade show: review how effective the previous version of the show was – what did you learn, what would you change, what would you keep.
6 months before the trade show: have a written brief for what you want to achieve, know what the key objectives are for each of the different target audiences, have the space booked, have the budget set aside and share this information with your stand design and build company 3 months before the trade show: have your design approved and ready to go; have your timeline agreed for event delivery.
If you achieve these three key milestones then you will have planned properly and success should follow.