OK but only if you stand on your head and sing something!
PLease put your question into the post header . . it aint 'alf annoying AND you may get more responses - yeah? This IS a polite plea . ..
OK, gently roll your cursor over the vey top right-hand corner of the Event. Youn will see your Cursor "Change " into what looks like a tiny Quadrant - yeah? Now "grab" it ad gently move the quadrant left. You should see a Dissolve Gradient to start to appear . .easy eh?
Look there are many ways of doing stuff in Vegas .. another way is to put up a Solid Black Event and "Push" this into the last Event. You now have a "Controllable Fade out too .. there are other ways . .have fun . .and please, next time, put your Question in the Post Box -thanks!