You can then take an individual event and crank it down 12 half steps, but this is a hack, and will break if you then change the key (or, for example, cut-and-paste a copy of it and change the key on that).
(You; can take; an individual event; T:then) (You; crank down; T:12 half steps; T:then) (this; is; a hack) (you; change; the key (or, for example; T:then)
You You this you
can take crank down is change
an individual event T:then
T:12 half steps T:then
a hack
the key (or, for example T:then