Start at least three months ahead. For large events (300+ guests, complex production), six months is more realistic.
The organisation runs in four phases. First lay the foundation (12 to 10 weeks before the date), then concept and partners (10 to 6 weeks). Then the detailed work (6 to 3 weeks) and finally execution plus aftercare in the last 3 weeks. Popular venues and artists are quickly booked up in autumn.