Is anyone good with AppleScript?

I am trying to use Keyboard Maestro to control Calendar (I’d like to have a macro that sets an alarm e-mail,) but it doesn’t work right. Tech support suggested I ask here about AppleScript. Is anyone good with Applescript?
I think it should say:
"make new mail alarm with properties {trigger interval:-1440}"
but I haven’t been able to figure out all the other necessary bits.

Toward the bottom of this page, you will find what you want I think.

All the examples are for “event 1”. Event 1 was an appointment in 2012. How do I specify “the event I’m currently looking at?”