Exactly what happened? Or what didn't happen? They ran the fireworks and fountains and finished out totally without Mickey?
Major Magic Spoilers, No Kids:
Only thing I can speculate is that one of the Mickeys wasn't in position and triggering the safety switch for his stage lift (probably with a foot switch, or a stagehand watching) or one of the stage lifts wasn't ready to trigger (Stage trap door or Mill Roof sliding door not open and locked, hydraulic pump didn't start, etc.) and they skipped the whole sequence to keep it from looking bad.
Another possibility would be an injury backstage, or there was an error earlier in the show that kept one of the Mickeys from making their final mark in time - the same performers do multiple characters and appearances through the show. They have to get off the island onto the Columbia, then onto the rafts, back onto the island, then Mark Twain, often doing a costume change in-between each, and hustle to their spots for the closing. If they couldn't get the ship docked, gangplank out, and off the ship and make their final positions in time... If there's nobody available that can sub for the missing performer, that's a problem.
They can't have Sorcerer Mickey pop up on the top of the Mill and do his sequence and then disappear in another flash of glitter-pots... And not have Sequinned Mickey show up down on the main stage for his last line, that would be even worse.
If they got that far into the show without any other major problems, far better for the Stage Director to hit the button to inhibit the fireworks and skip the sequence, and get to the end of the show. An E-Stop at that point would be far worse.
Oh, and I'm operating off the assumption the headers are correct and this was posted at 1 AM Tuesday April 3rd, so "this past evening" would be talking about the show on Monday April 2nd. NOT Fools Day Sunday April 1st. Words Have Meanings.
--<< Bruce >>--