Okay.
Name your objects.
Brick one (NAMED BRICK 1): (Ticked) OnActivate><NAMED BRICK2>>setEventEnabled>0 (checked)
Second brick (NAMED BRICK 2): (Un-ticked) OnActivate><NAMED BRICK3>>setEventEnabled>0(checked)
continue as needed...
Last one: (Un-ticked) OnActivate>Self OR NAMED BRICK>(whatever event you need to have activated)
Hopefully that helps. If I did something confusing, which I know a lot of this is, tell me and I'll try to make it better.