TorontoDance.com

Here are some 2010 Halloween Dance events that have been submitted to TorontoDance.com. 
Disco Halloween Parties

Disco Inferno Hallowe’en Party
(Friday October 29)

Swing Halloween Parties

Halloween Rock’n Roll Dance Party
(Friday October 29)
Halloween Swing Ball featuring Alex Pangman & Her Alleycats
(Saturday October 30)

Salsa Halloween Parties

Toronto Dance Salsa Halloween Bash (Saturday October 30)
Go Dance Mambo Halloween Party and Bachata Competition
(Sunday October [...]

2010 parties are here:
http://torontodance.com/news/dance-event/dance-party/halloween-dance-2010
Here are some Halloween Dance events that were submitted to TorontoDance.com in 2009:
Halloween Dances on Friday October 30, 2009

Fit2Dance Thiller Social at 7:00 pm
Lindy Collective Halloween Party at 8:00 pm
Dance District Halloween Party at 9:00 pm

Halloween Dances on Saturday October 31, 2009

United Salseros Halloween Bash at 5:00 pm
Swing Toronto Halloween Ball at [...]