depends upon the month
food & wine - Late Sept thru Early Nov - you need to make it at 11 months.
most of the summer months - again the earlier the better
Dec - all the
DVC resorts (except the big ones - OKW, SSR & AKV) need to make it as early as possible.
hoping after this year - flower & garden - early March to late May - will be added - it never had the popularity of the f&W but with Disney adding food to it - it just might. It is pretty wonderfully - will miss not going this year to it.