Hi Nancy,
Although many guests will stake their spot for viewing IllumiNations: Reflections of Earth as early as 90 minutes prior to showtime, I don't think you'll have much of an issue viewing the show right after dinner. Just be aware you may not be seated exactly at your Advanced Dining Reservation time, and you will likely not have a front row seat for IllumiNations. With either scenario, you won't be disappointed as the show is larger than life and accompanied by a very moving musical score. With several viewing spots surrounding World Showcase, I'm certain you'll find a perfect little niche. A few of my favorite spots include the balcony just outside Tokyo Dining in Japan, the Italy isola near the lagoon (if a private event is not occurring), or on the bridge between the UK and France pavilions.
Another tip is to book an Advanced Dining Reservation around 7:30 p.m. - 8:00 p.m. at the
Rose & Crown. Although not guaranteed, arriving 15 minutes prior to your Advanced Dining Reservation and requesting a patio table will provide you the chance to view IllumiNations from a perfect vantage point.
I hope my suggestions were helpful, Nancy, and I wish you the most
magical vacation!
Sherri