In years past the parades for the parties always started on Main Street and ended in Frontierland, because there is more room behind Main Street to stage the floats and there is more lighting for performer safety. However over the past few years they have made modifications to the Frontierland step off area (more lighting, sidewalks for the cast, etc) and it is now feesible for them to start there with night time parades, although Spectro Magic still starts on Main Street (there are way too many floats and not enough room to get Spectro set up behind Frontierland). They did run a few Party parades from there last year to test it out and decided it worked so they are scheduled to be running the Christmas Parade for the parties from Frontierland to Main Street.