TedX videos have moved from the TED site to the TEDx Talks - YouTube 
channel.
Find pages using the now obsolete TEDX keyword.
ITEM video TEXT TEDX
The example talk we used which used `TEDX TEDxPortland-Ward-Cunningham` becomes `YOUTUBE BdwLczSgvcc`
YOUTUBE BdwLczSgvcc Ward Cunningham