My birthday is October 7th, I found these:
on October 7, 2001, Déjà Vu opened at Six Flags Great America (Since moved to Silverwood)
On October 7, 2010, ten people received minor injuries when the two Pony Express (at Knott's Berry Farm) trains collided in the station of the ride. The launch system failed to power the first train over the first hill causing it to roll back into the station and collide with the second train.