Hi Ana Marie:
I regret you weren't able to secure tickets to Mickey's Not So Scary Halloween Party. While Halloween is a fun time at Disney World, outside Mickey's Not So Scary Halloween Party, options are a bit limited.
Several years ago, Downtown Disney hosted a party and trick or treating event on Halloween, with shops and restaurants throughout Downtown Disney offering goodies during the evening hours as well as a kids' dance party. However, in 2011, this event ended as it was getting too crowded for Guest enjoyment. Downtown Disney restaurants will still have fall menu items, and there will be seasonal decorations and enhanced entertainment during October at Downtown Disney, but the same party atmosphere and trick or treating will not be available at Downtown Disney.
Although subject to change, in the past, a handful of Resorts, particularly Fort Wilderness, Wilderness Lodge, and Saratoga Springs, have presented Halloween activities, crafts and games, particularly on Halloween day. If staying on property, when you check into your Resort, ask if the Resort is hosting any Halloween themed activities, particularly on Halloween day.
Enjoy your vacation.