For small parties (up to 80 people): 8-10 weeks ahead. You have fewer guests, simpler programming, no complex coordination. For mid-sized (80-200 people): 12-16 weeks. Booking entertainment, arranging catering and coordinating the venue takes more time. For large anniversary parties (200+): 6-9 months. The bigger it is, the earlier you should start. Arrange entertainment 5-6 months ahead. Good acts fill up fast.
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