Sounds like its sorta like IllumiNations. From morning to mid afternoon, World Showcase Lagoon is empty, and then by late afternoon, the barges are brought out and the techs start their final checks.
I'm guessing WoC will operate on a sort of hidden during the morning/visible during the late afternoon schedule. There's so much hardware and show equipment that raising the platform(s) during the day to check/fix things is probably almost a necessity.