on the 2nd and 3rd questions, and it's bed-time, so here's a couple of guesses...

"A big event happened when Nevada aired its first world wide broadcast. It came from a casino. Name it."
"Name it." Is 'it' the event or the casino? The atomic testing was a big event...could they have broadcast one???? The Fremont was the tallest building in LV when it was built (15 stories) and housed the local radio station and tower...but worldwide...??????????
(Then again, it could be more current, like a world wide broadcast of the WSOP or something... )

"On October 29, 1932 the worst financial disaster as a result of the depression caused all Nevada banks to close except how many?"
I dunno...three???

Thanks for the contest!

(even if I did flunk... )