From the Palace website:
The Park will be closed from 2pm on Thursday 31 October until 3pm on Sunday 3 November. The Grove will be open throughout (NB: exit/entrance via our Muswell Hill only, no through route into the rest of the Park via The Grove).
Alexandra Palace Way will be closed, and the W3 bus on diversion via Wood Green, from 1.30pm on Thursday 31 October until 3pm on Sunday 3 November.
The Palace's car parks will be closed, and there will be parking suspensions on some roads surrounding the park.
The 184 bus will be temporarily diverted via Park Avenue and Bounds Green Road on the evening of Friday 1 November and Saturday 2 November to facilitate visitors leaving the event. Buckingham road will be closed for about an hour for the same reason. (No info. about when it will be diverted.)
TfL info. :
"Alexandra Palace Way: Route 184 is diverted in both directions due to firework display. Buses are not serving stops between Wood Green Station and Woodfield Way."
(curious - 184 doesn't go along Al Pal Way! and no info. given about when this will happen)
"Alexandra Palace Way: Route W3 is diverted in both directions due to firework display. Buses are not serving stops between Wood Green Station/ River Park Road and Nightingale Lane." (again, no info. about date/time)
Nothing about the event in their Weekend Travel Advice email whatsoever.
Perhaps there's more info. on the bus stops ...
Replies
Info. on bus stops:
184 will be diverted 9pm - 10.30pm on Friday, 8 - 9.30pm on Saturday. Via the High Road and Boumds Green Road.