Hi Kraig,
You are going to have so much fun at
Mickey's Not-So-Scary Halloween Party - it's my family's absolute favourite
Special Event at the Walt Disney World Resort.
Although the exact details have not yet been released for this year as of yet, I can tell you that last year, Mickey's "Boo-To-You" Halloween Parade took place at 8:35 PM and 11:15 PM. The Parade typically begins in Frontierland and ends by the park entrance.
I expect that being so close to Halloween itself, October 30, 2016 will probably be one of the busier dates to attend Mickey's Not-So-Scary Halloween Party.
I personally think that so long as you arrive at
The Crystal Palace 15 minutes prior to the time of your 7:00 PM Advance Dining Reservation, you will have plenty of time to enjoy your meal (without being rushed) before finding a spot to watch Mickey's "Boo-To-You" Halloween Parade.
Main Street U.S.A will most probably be lined by guests already waiting for the parade when you exit the restaurant. Because of this, I would recommend looking for a spot to watch the parade from around the hub area as you enter the
Magic Kingdom Park. (If Main Street U.S.A is jam packed with people, I would suggest that you walk through the shops to reach the hub area as opposed to battling through the crowds.)
Wishing you a spooktacular trip filled with memories which will last a lifetime!
Emma