Seven Card Monte

<spoiler>The sky-writing clue is 263-, which suggests a phone number. Rather than the numbers on the cards, one pip on each card is clickable and turns the card over. If you index the pips: 1 2 3 4 5 6 7 8 9

... the clickable ones are in positions 8, 7, 7, 4, 7, 8, 6.

Calling (877) 263-4786 gives the following message:

OK, I am officially impressed! good job finding me. To solve this clue, tell me what disappeared on Halloween 1926 at 1.26 a.m. Room 401.

The answer is: HOUDINI (who died at that time and place)</spoiler>