I don't think they've ever had the first party less than a week after Halloween. I don't think it takes a week to decorate though - I saw once on a TV show that it takes 3 nights.
Dates should be announced in April since they usually go on sale in early May. However, you can pretty much guarantee that there won't be a party on a Monday - parties are typically on Sundays, Tuesdays, Thursdays and Fridays.
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