Thanks Jay. Here is the info I found on Allears regarding start times. From this, it looks like it starts at the same time every night and is only delayed when Wishes is at 9:00 pm. But that pretty much every other night, it starts at 9 and pass the GF around 9:15 (I had been thinking 9:45 for some reason).
Although the pageant generally follows the schedule below, check with the Guest Services Desk at your Magic Kingdom Resort for times during your stay. Inclement weather can cause cancellation of the pageant.
Polynesian Resort -- 9 p.m.
Grand Floridian -- 9:15 p.m.
Wilderness Lodge -- 9:35 p.m.
Fort Wilderness -- 9:45 p.m.
Contemporary Resort -- 10:05 p.m.
Magic Kingdom -- 10:20 p.m. (only during extended MK park
hours)
Note that when the Magic Kingdom Fireworks are scheduled for 9 p.m., the Electrical Water Pageant runs about 7-20 minutes later.
Based on the 9:15 parade time, I'm thinking we may want to make our ADR for earlier than 8:00.