Sorry about Chasey. She's having a bad week, what with her lice and all.
If you call the st. marys county govt recs and park number, ask for Cindy.(she is the head of the holiday event department - If Cindy isn't it then just ask for the holiday event department, I'm sure Jackson will help you out as well). There are some neighborhoods in the county doing in on Sat and others doing it on Sunday. (Certain Amish neighborhoods aren't doing it at all...something about sinners, etc).
Anyhow....if you live North of the Walmart you're good to go on Sunday, South of Walmart, Saturday. (unless you live in Westbury then its Sunday morning because lets be honest, no one wants to get shot).
Please know (and I'm sure Cindy will remind you), no candy with peanuts this year. Candies with any peanut byproducts have been banned in the county this year what with all of the peanut allergies. Also, your child must use the county approved trick or treat bags. (you can get them at any library, foodlion, or post office).
Have fun!