Unfortunately, there's no Scooby Halloween marathon this year, but for those who want to celebrate the day with Scooby, I thought I'd post the episodes that are airing that day.
7:30a - Scooby-Doo! Mecha Mutt Menace
8:00a - Scooby-Doo! Moon Monster Madness
12:00p - Scooby-Doo! Ghastly Goals
3:30p - Scooby-Doo Adventures: The Mystery Map
5:30p - Scooby-Doo and the Beach Beastie
6:00p - A Scooby-Doo Halloween
7:00p - Scooby-Doo and the Spooky Scarecrow
9:00p - Scooby-Doo! Moon Monster Madness
11:00p - Scooby-Doo! Mecha Mutt Menace
11:30p - A Scooby-Doo Halloween
11:00a - Scooby-Doo! FrankenCreepy
1:30p - When There's a Will, There's a Wraith
Note that all times are in the central time zone.