You could set up trick or treating on your lot. I have talked to people that have set up full hunted house style stuff with empty indoor units. This brings people to your lot. My lot is in a bad location for this idea but maybe yours will work. Good luck!
You could become an idea centre for the greatest costume ideas via cardboard boxes and moving supplies. We see people coming in to buy cardboard and supplies to be robots and such. Thus, you could help them out with templates and ideas and you can even setup a mock costume for an example. Have some treats on the counter for customers too.
Sponsor a "safe" TRUNK OR TREAT event where you get tnts and others to participate in decorating their car trunks and coming to your property, bringing the kiddies giving treats to the kiddies. For ideas on decorating, go to Pinterest and search trunk or treat.