It really depends on the size of your event. The longer lead time the better to assure you get the entertainers you want for your show. For bigger venues, such as arenas, fairs, festivals, etc. TSE recommends you start at least 9 or 10 months out from your event. A year is even better. Long lead times give you a better selection of acts to choose from for your event. Remember weekends are prime booking dates, so plan as far ahead as possible.