Pretty neat regarding the fireworks. Pretty cool. I love to see stuff explode/blowup. Looks like a pretty good show for a bunch of "amateurs"
Most receivers/PJ's have a 12v trigger outlet for just such a purpose. This would send a signal from the receiver/PJ to the screen to go up or down depending on the situation. Monoprice should have the cable you need, I think in most instances it is a 1.5 or 3.5 mm plug just like a headphone jack plug. Other than that for my PJ install I ran HDMI, RCA cables (to cover component and a couple of extras), and of course power. Now I would have run CAT 6 as well as another HDMI cable too.
In that show we shoot 5,6,8 & 12" dia shells, not your typical weekend cabin type of party.....
I ran a hdmi 1.4, and 1 cat6 cable, not sure if my receiver has a 12v trigger input, what then? This is only for future, it will be there covered up for a while, not like it will be used right now,
no cables from the pj screen, I would control the drop down screen with a remote, and not mess with any more wires....